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                      ! " # $  %&! "    '#(  )('                                          !    "     #  "   #  "$      "   %#  "    "        &"       "  '  "  (              )       "    #  "  "     "  "*  "+*  &$         "             "   '( " *  ' , -#      ".     !  "  "     )       "      "    ."  $#   '+ " )  )  ,+      )' ' " ,  -  . /'$  0  '    ,+  )( "   1   ,+  )( "   ) +  ( 23 43 /0  "        "  " #  "       1 /0#     !     / #  "    $       1'#      (    !  1 /2#  "3!     "       " #  "    "    '   !  )       "      "   " "      "   -  0     %4-5("  ""  3      "$        "    "  *  #     -  !      #  "  .         /2    " #  "       $    "#  "  1 /  "      !       " #  "       $    " #  "       $  #  "  1 /      3  "  -6 /"         "        #  "      "  #  "      "   "  )     #  +  +"#  "       "       "#  "      "       "      #  "     7        $              /-  3    ""  !       #  "                     #  "  1 / 2      #       ,+   5  0 " ( 6     0  )( "   ,+    )7  )   , " 078( 9 ,   /-  "+  !       " #  "    ' #  "  (      /4."  $#     !   /  48  +  "                 -   !   /  3.  "  $  #       /-  #."  $  '!          8,2( /     !  "3.      "# /4.  "  "3#   -6 /4."                   ,+  :5  0 " ()  ) ;  ),  1  <5  )( " 1  < 6+ /9#  "  !    )       "      ""             "  #  "      "               '  (=  ,+    )'     , " 0' '( " ,+  )'   -      " #  "'   "*  "  $         (  $   .  "     "     #  "  .         #  "      "3 "    /'  , " 0' 5  " #  "         $     "  #  "           "      #  "  .     !    '*  .           "  #  +  ( :'>( 9 ,  '   #  +  +"#  "       "        "  #  "           "    "  #  "   7        $             '  );  ),  1  <5  )( "  1  <6+' ' ?  -  0 0+  )1    ) ,'        "  '    (   #  ""  #       "  #  "  $             "   !"    $      "   )             )     "     #  "*     !    "  "     !      "   #  " 6 :     "'#.  ("  "    "  "     "      ) /      3  "  -: /0  "      )       "        "  #  "        "            1 /-    46: #  "     $    $    ;  "  ;     5          $      !         "3    $  $  "3   # / #    #  )       "      "#  "  "        "  #      " #  "      !   !  "       "   #  "     #  "   /  #  )       "       "#  "  "*  "+*   "$  "    15       "  "     "    "3  "    ""  "+   $  ' 3  ("    "  "  "   1 /5  )       "       5"$  "    1 /-      $  :  $     .   /-  3  "  -<&       "      "    "      #  "      "=  > ?-@  "#  $    " "      >$    "     /7  )       "      "#  "   "  "            $          "          "       9  !    "    #    "    "  A-  ""   !  $    "    7  /       /-  ""       )3      $  B#      6C+  " # 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 "*  "#        /-  3  "  -=     "    "    1 /H    "    "  *  " #    G"  "     "  4   8,1 /-    "  #    "  "     1 /%#  "  "    G     1    .+  !       1 I4F-   #  "    "      "          7    "   4F-J4  "    E7       /?    "    ""     "*  "#    G"     "   /4."  "  '$#    .  "        "  *  "#   ( /9#  "$      "    *       #  "  $            "   G  "     /4  "      +3  +)          "       #  "  4      +3  +   )      "         )            "            #  "*  "     "    "   "  #  "   A3   ,+  4( " )+  7B    /, "  $    !      *    "$        "    G  "  -              4F-      47G  "    "   /9    $    "#  +    +#       #      "  +"3'$    "            ( ?'C(  6  0' <            /$  /%&! "   D " !  % '#(  )('                    "*    9#  !    "  "         +"              "#  +      ,        "         "*        !    93      "  "    K "        "*      "  ""#  +"""    "   #    "      "*    ""  "    *  ++   '( " *  ' 4   3  :::<"#  $   5  ".    "#  +       "*     '+ " )  )  ,+      )' 'E " 0<*  )( 9 'F:3G -#  "  $    1  )       "      """  "  $  1 %#  "  "           1 /'$  0  '    ,+  )( "   1   ,+  )( "   ) +  ( BL 6CL /  9#    "    "             "  "     1  -  "    "    #    "   "  17   1 /M  $  +N"       "  "   #  "     "3  '/(    "   "       "  '/(   "     "    .   /  2                                #        $     #   "  "  "!  "    "    #  "    "   $     "      .      #   "   "   /-  ""    $    0N!             1"    "1 /    .  $      3   "  "    "  " "               "        1#  )3  "  "    1     ,+        -    6     01  1  +  )<(*5   )( " )( " ,+  ' /4.  $    "      "  $  #      /-    "3!     !#   $  3       "     "   /          '  )3)O3$$$*"  "         +( ,$         .    "*   '"    "  ( /  4.  "        "    "      "    #  )3  " /-"  "    ?      = '6(   ,+  /5  0 " (6   '( " ,+  B " ,  (' '+  ),+  <(*5   = Quãngđườngđiđược Tốcđộtrungbình Thờigianchuyểnđộng     = 7   P.*  PA /'( " ,+  B " ,  ('  -    "*    $            $      "*    G     "      = 6QL /  -                )3 "  " G          "  "#  "  "      "   "      "     "                             "              $        "  .  "     "          /9#        $    1 /"    $       "*    1 /-      "         +     "  "    "    $                  19  !         #       /F               !  "1 /, "  $           "*     E -       "*       $                    $    "*  G  "    "   "        /    "*           ".  !   "#  "  "         / -   !          "*    1 /  F                     "*      *       1 /9#    :    "*              "                     "  "           .3              ) /-  3"    8,2  "     +"         "*    "1 /-   3     "+"       #  "     E46-    )#  "+  " "       "    ') Q  JQ( ,  "  '"JQ($  $  #  "     *  "  #                       "         'E(  "  "      0)( " ,+  B " ,  ( 1  8( 9 ,  ,,  ))( "  )( " ,+  B " ,  (' /-    $*  3""  "  $  #   /4..  "  $  '     "*    ( /0    "  $    #       E-    "*    $        "        E-    "*    $      "  "*     "       /,#       /     !   /  '6(.        = = /            "*           ."  $  "#     "       "     ,+    :  5  0   " ( .  <5    )( "   ,+   1  ,+      ,+  H   )( " )( " ,+  B " ,  (' /        8,2          )#!  +"       "*     Q Q      = + = + ':( /4."  $#      "     #      "  "        :'  >( 9   ,    ,  ,  ) <  )( "   ,+    B "  ,  ('         = =      "*           . "   $   "#        "         " '    <5    )( "  ,+  1  ,+      ,+  H     )( "   )( "   ,+   B " ,  (' '    <5    )( "  ,+  B " ,  (' Q Q       = + = + /'+      ,+  H   )( "   )( "   ,+    B "  ,  (' C E4:-    )#  "+  " "       "    ') Q  JQ( ,  "  '"JQ($  $  #  "     *  "  #                       "         '/(  "  "     /7    !  "  .  +  "        "          #  "             "       "  "  !    "  "    K"   /  %  "    ':(     !   "  "    .    ""   1 /9   3    "  "    K"                 "*         "    " "   /,    %  $#  +  ')"(               )           "     "    "         "     $  "  "  '"(   "  "$  "  "    ')( E7  "  "  "  "  3   !     :+   /    "  "    K"         "*     "  "      1 /      " 3   :     "       :        "*          "    "  "  "    "  "  "  +           "    :       ,  .  :  "    *  ""     "   E9#  $  "      )       "        *  +   1 /"    .  J)E /  3  +!    "   "        "   EH    "           "    +"   '  *    "($#  +  ')"( E93    "  "    );)        "        "  "  "                   /-"  ".  +  "     "          #  "           "   /4      .3  *  +  /-  $"  "    .3  )      "       "       :    *  +  6QL   ,+  @( " )+  7B    ' /, "  $    !"     /-    "*    $    1"  "           +"           "*    1 /9        $    "#  +"8,2E8?   #      "  +"3 ?'C(  6  0' R            : $  :%&! "   D " $!   " !  % '#(  )('    9  "  "          3     3"  ! #  "  "  "               $   #  "$  ""               "*        !#    #  !#     9  "  "  "   #  "   3      "   #  "  K"  "    "*   !#       #  !#     9  "  "  "       *       +       $    "  "     "*  !#    #  !#     9  "  "  "           +"      "     "*  !#    #  !#        ,      "           "*         '( " *  ' ?  '6  !    66        66    #  #( '  <5   "   ' ' " ,   /'E " 0<*  )( 9 'F@3G 9  ""  "           +"            "*     1 :'$  0  '    ,+  )( "   1   ,+  )( "   ) +  ( 6L /2 )3  "     "*         "   #  "  "     "  "  ".3    "   #  "  "      !   !    #  "      "     "       "  )3         ,+  + " )  )5   (+    )  .' /-    $*  3.  '?  +  )  )  '( "  B NL #     "    "    +    "*     '9@  )3 $* "  *  "  +*   ( 9#  $  "        "          $             1 #  "    "    )     $    1,  "    "  "    1 /5   #  "+  !        #  "  "  "  19#   #   "  "  "  $    1 / 5  " #  "      "*        ""     5    )3           #    "   " +  $    1 /  .+  )3  "     #  ""  "   #  "  *   t ∆ 1-  "    +!   "      "   #  "  1 /9#   "  "   "     "   *  "    1S         1 /9#  "  "  "    +  "            !     "    1 /-  3  "  -6 E,      "  "  "       )3  " 6 /-  3    :8,2     ""  .   #  "  "   "  $    "  $   3"1 /,#       3" #   "  "  "   /-  3  "  -: /-  "       *           "*     "  "  "  #    "             $              $            #  "  $     -  "  "    "       *     #  "   "  "      "         "               /      $       "*        1 EF          1 7   $       #   "   "    "     ,+  /5  0 " (6     0  1    +  )    )    ' ( " ,+  B " *  ,+ "  ,  (' /  8,2  "  $   E  "  #  " *   t ∆   "  $    5)3!         "          s∆ $   /"     #  "  "             "   !   "  "   #  "  "     "*     s v t ∆ = ∆  '6(  $    $     #  "  "  "     #  ""    "    E-"  ""       #  "     #   /-  +  "   /-  #  "  -6 /4.  8,2  "  $  #       /-  #.$  -: /  8,2  "  $     #      ,+  B " *  ,+ " ,  (' '+  -  )( " 1  +  )  )   ' s v t ∆ = ∆ '6(  $    $     #  "  "  "     #  ""     "   E-"  ""       #  "            #   /'?I)1  +  )  )  ' 93" #  "  "  "    6 #  ""    "  $    " 3"     "   #  "                      !  "  $       $     9"3  ""  )        :'( " ,+  B " *   ,+ " ,  (' /            "*           $     #   "   "    "    *   "*    *      "3"   /-        $     #  "  "  "  "*  "3 "    $       "*  !#     /-        $     #    "    "    "           "3"    $       "*  #  !#     I-        !  " #        $      % # &   %  ' # "(    !        N 6QL "  "    "  "      1 /  -   "   +#         "*        "     !        1 /, "  $           "*       I-        !  " #           $         % # &   %  ' # "(    !        /           $* "  0#  .  $     "   #  "  "  "  "    "   #  "  "   /-  3  #  )3  "       "   "     /-  "  $   #  "  "  "  "         "  "1 /,  "    $"*"   "       /7  "  "  #  " #          "*       "       "  !          #  "   /7         "*       "    !          #  "    "  "  #  "     #             1 /9#    "     "         $  "   9#  "    "  "    1'"  $#    ( /-      3"  "  .        "*      #    "    "   "  #  "   /  .    $    $           $  "                       *     /9#    "    "   "    1    +  "       "  1-  "       1'"  $#  ( /  '    $#  (  @           "  "      " "  $    $        $   3"19  .1 /  -   "   +#         "*                "       "*  !#                  "*   #  !#         ,+    :    )  ( 6      0    +  )  < )( "   ,+    B "      ,  (' /F.  ", "     $    "   /    "   #  "  "   "  "  "    "    /9#  "  "  "  $"* /2   /2&9   #  "  $"    / 4. "  $#    )#!     "    "   0 v v v∆ = −     "'"*( #  "   0 t t t∆ = −   "   0 0 v vv t t t −∆ = ∆ − /2  8,2"#  +"   "  $#   9#    v a t ∆ = ∆  ':(,"         $    $  )     *  ".        "   #  "        "   #   "     " -     $  P. :  / 0     9   "    +  "      #  "  "   $    $   3" /  9   T Q     v ∆ r     +          v r   0 v r  93"  a r     +     '  ( "   ,+    B "    ,  (' '    +  )  <  )( "  ,+  B "   ,  (' 'E    0+  )  v a t ∆ = ∆  ':(  ,  "           $    $  )     *  ".        "   #  "        "   #  "    " 0 v v v∆ = −        " '"*( #  "  "   "   t∆ ' 0 t t t∆ = − ( /  ,  "              " #  "    " #  "3"  -     $  P. :  *'?I)+  )' 9   #  "  $    $   3" "    $    $   3" 0 0 v v v a t t t − ∆ = = − ∆ r r r r  0 v r  v r    0 v r    a r v r 2 #  "-7@7 3" "         #  "       +     "      +             3" #  "       !  "  $       $      "   "3  ""  )       U CL BL /   $    $   3"  "  +      "    1 '  "  $  "      !#    ( /9#    "     3" "  "1 /V    ""     "*    "  "      $  *  1'              "   #   "   "1( /-  "!       "   "    )#!   "  "   #  "  "     "*  !#     /  $#    )#!   "   #  "  "     "*  !#     /9#    "  "    ! #  "  "  "    -7@7 *    "     1-  !  "    1 /-  ".      "  "    "    1 /"    "     3     "   3    "     !.    "   #  "   "    "    "3  "      W     "  -< /4    ""  "    "  "    1 /7     -7@7     $   #  "  "*  "3"     "       "    "    "       "    0 2 tb v v v + = /2  "  +   "   #   "    3  "  "   "  "         "-7@7 /  3  "  -=C /-  3"  "         v ∆ r     +         3"  #    "   0 v r  v r    0 v r    a r v r 0 0 v v v a t t t − ∆ = = − ∆ r r r r ':L( /48"  $#    "  $       ,+    @    )  ( 6      0  1    +  )  < )( "   ,+    B "      ,  (' /0   E    "  "   0 0 v v v a t t t − ∆ = = ∆ − 'I( E$#    "    "     " Q '" Q JQ( t t∆ = E   'I( 0 v v a t − = .  0 v v at = +  '<(      $    "  "   #  "  -"  " #  "     #  "    "        /8  !    "  "      "  "$   #  "  "     $  "   /  3  "  -<   ,+  4J  )+   )  5    8( 9   ,    , <K1  0+  8(   7171 2 7 tb s v t = 0 2 tb v v v + = 0 v v at = + 8  2 0 1 2 s v t at = +  '=(   $  "  "           -7@7 /'?  +  ))( " K' '+  )5  1  +  )'     "  "   0 0 v v v a t t t − ∆ = = ∆ − 'I( E$#    "    "     " Q '" Q JQ( t t ∆ = E   'I( 0 v v a t − = .  0 v v at = +  '<(      $    "  "   #  "  -"  " #  "     #  "    "        *'+    1  +  )H  ' :'  +    )  5    8( 9  ,    ,  ,  )  )( "  K'      "    "    "      "         "*     tb s v t = 7     -7@7     $   #    "    "*      "3  "           "       "  "  "     "   0 2 tb v v v + = Q $   #  "  #  & $   #  "         0 v v at = + 8 2 0 1 2 s v t at = + '=(   $     "    "             -7@7 @' +    ) -      9    +  )7  1    +  )7  8( 9  ,    ,  ,  )  )( "  K' 6Q [...]... tớ c đầ u 1 2 at (0,5đ) 2 1 4 .10 2 2 - Xe x́ t phát ta ̣i A: x1 = at 2 = t (1) (0,5đ) 2 2 1 3 .10 2 2 - Xe x́ t phát ta ̣i B: x2 = x0 A + at 2 = 398 + t (2) (0,5đ) 2 2 Ta co : x = x0 + v0t + b Vi ̣trí và thời gian để 2 xe gă ̣p nhau: 3 .10 2 2 t 2 t1 = 282 ,13 (s) (1 ) thay ⇔ 0,5 .10 2 t 2 − 398 = 0 giải ra ta đươ ̣c:  t2 = −282 ,13 (loại) 2 vào (1) : x = 2 .10 −2 ( 282 ,13 ) = 15 91, 9 (m) (0,5đ)... v’ = 60km/h Giải m  v = 11 ,11  ÷; s  a Gia tớ c của đoàn tàu Go ̣i thời điể m lúc x́ t phát t0 (t0 =0) a= ∆v v − v0 11 ,11 m = = = 0 ,15 8  2 ÷ ∆t t − t0 60 s  b Quang đường mà đoàn tàu ̃ đi đươ ̣c trong 1 phút 1 2 Ta co : s = v0 t + at 2 s= 1 2 1 2 at = 0 ,18 5 ( 60 ) = 333 (m) 2 2 c Thời gian để tàu đa ̣t vâ ̣n tớ c v’ = 60km/h (v’ = 16 ,67m/s) ́ Ap du ̣ng cơng thức tinh vâ ̣n... ̣c trong 1 phút 1 2 Ta co : s = v0 t + at 2 s= 1 2 1 2 at = 0 ,18 5 ( 60 ) = 333 ( m) 2 2 c Thời gian để tàu đa ̣t vâ ̣n tớ c v’ = 60km/h (v’ = 16 ,67m/s) ́ Ap du ̣ng cơng thức tinh vâ ̣n ́ tớ c trong chủ n đơ ̣ng thẳ ng - Trường hơ ̣p này vâ ̣n tớ c lúc nhanh dầ n đề u đầ u v0 =? v '− v0 v ' = v0 + at → t = a 16 ,67 − 11 ,11 t= ≈ 30 (s) 0 ,18 5 Bài 12 trang 22 SGK Cho biế t t = 1phút; v... điể m) ̣ 1 C 2 D 3 B B Tự l ̣n Tóm tắ t xoB = 398m a1 = 4,0 .10 - 2 m/s2 a2 = 3,0 .10 - 2 m/s2 x1 = ?; x2 = ? s =?; t = ? 4 D 5 B 6 A 7 C 8 B 9 A 10 C 11 A 12 B 13 C 14 D Giải s = 398m B A≡O (+) x a Phương trình chủn đơ ̣ng của mỡi xe là: Cho ̣n chiề u (+) là chiề u chủ n đơ ̣ng của 2 xe, gớ c to ̣a đơ ̣ ta ̣i A x0 A = 0 ; thời gian lúc bắ t đầ u chủ n đơ ̣ng; cả 2 xe đề u khơng co vâ... 0,025 δ A1 = 1 10 0 % = ≈ 0,0 010 2 ∆A 24,457 A1 δA= 10 0 % A Sai sớ tỉ đớ i càng nhỏ phép đo ∆ A2 0,0025 δ A2 = 10 0 % = ≈ 0,00024 càng chính xác 10 , 354 A2 δ A1 < δ A2 Vâ ̣y phép đó thứ 2 chính xác hơn phép đo thứ nhấ t Hoa ̣t đơ ̣ng 5: Tim hiể u cách ̀ xác đinh sai sớ phép đo gián ̣ tiế p - Chú ý để nhâ ̣n thức vấ n đề 7 Cách xác đinh sai sớ của ̣ phép đo gián tiế p 31 đo... (m) (0,5đ) Hai xe gă ̣p nhau: x1 = x2 → 2 .10 2 t 2 = 398 + Vâ ̣y 2 xe gă ̣p nhau sau thời gian chủ n đơ ̣ng là t = 282 ,13 (s) ; quang ̃ đường đi đươ ̣c là: s = x = 15 91, 9 (m) Ngày soa ̣n: 15 /10 Ngày da ̣y: 19 /10 ́ Tiế t: 16 Chương II: ĐỢNG LỰC HỌC CHÂT ĐIỂM ̉ NG HỢP VÀ PHÂN TÍ CH LỰC - ĐIỀU KI ̣N CÂN BẰNG CỦ A CHÂT ĐIỂM ́ Bài 9: TƠ I Mu ̣c tiêu a Về ki ́ n thức: Phát biể u đươ... = 16 − 8s + s 2 g v v đáy vang lên 2 s ↔ 2sv = g ( 16 v 2 − 8sv + s 2 ) Ta co : s = v.t → t2 = v ↔ 9,8s2 − 243672s + 34 ,15 .10 6 = 0 Mà t1 + t2 = 4(s) Suy ra: -Giải pt bâ ̣c 2 ta tìm đươ ̣c s 2s s 2s s + =4⇔ = 4− g v g v Bài 7 trang 38 2 Tóm tắ t: 2s 8s s = 16 − + 2 va = 40km/h; vB = 60km/h; g v v vBA =?; vAB = ? ↔ 2sv 2 = g ( 16 v 2 − 8sv + s 2 ) Giải ́ ↔ 9,8s2 − 243672 s + 34 ,15 .10 6 = 0 Ap du. .. ̣ IV Rút kinh nghiêm ̣ Ngày soa ̣n: 15 /10 ; Ngày da ̣y: 17 /10 Tiế t: 15 I Mu ̣c tiêu a Về ki ́ n thức: ̉ ́ KI M TRA 1 TIÊT 34 Củng cớ và khắ c sâu ki ́ n thức của chương I: + Chủ n đơ ̣ng cơ; chủ n đơ ̣ng thẳ ng đề u; chủ n đơ ̣ng thẳ ng biế n đở i đề u; sự rơi tự do; chủ n đơ ̣gn tròn đề u; tinh tương đớ i của chủ n đơ ̣ng ́ b Về ki ̃ năng: Rèn lun tính cẩ n thâ ̣n,... du ̣ng cơng thức S = a.b Nơ ̣i dung I Phép đo các đa ̣i lươ ̣ng vâ ̣t li Hê ̣ đơn vi SI ̣ 1 Phép đo các đa ̣i lươ ̣ng vâ ̣t li Phép đo 1 đa ̣i lươ ̣ng vâ ̣t li là phép so sánh nó với đa ̣i lươ ̣ng cùng loa ̣i đươ ̣c qui ước làm đơn vi ̣ Phép so sánh trực tiế p nhờ du ̣ng cu ̣ đo go ̣i là phép đo trực tiế p Phép xác đinh 1 điạ lươ ̣ng ̣ vâ ̣t li thơng qua 1 cơng thức li n... =? Để v’ = 60km/h Giải  km  40 .10 0 0  m  v = 40  ÷=  ÷ 3600  s   h   km  40 .10 0 0  m  v = 40  ÷=  ÷ 3600  s   h  t = 1phút = 60s a Gia tớ c của đoàn tàu - Từ đó áp du ̣ng cơng thức gia Go ̣i thời điể m lúc x́ t phát t0 tớ c, quang đường đi đươ ̣c và (t0 =0) ̃ vâ ̣n tớ c để hoàn thành các câu ∆v v − v0 11 ,11 m a= = = = 0 ,15 8  2 ÷ hỏi đó ∆t t − t0 60 s  . Q JQ  J  1& amp; .  J  1 "  J1 7   L  J RQP  "  40 .10 0 0 40 3600 km m v h s     = =  ÷  ÷     11 ,11 m v s   =. J=QP& Q JQ J 1& amp;. J 1 "J1 7   L J RQP  "  40 .10 0 0 40 3600 km m v h s     = =  ÷  ÷     11 ,11 m v s   =  ÷

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