Vat li 8

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tb S S V m s t t + + = = = + + ~u  + ? — › +)F — › ` —  ; tb tb tb V m s V m s V m s = = = I_6S šF› f 2 š;`:6— uš‡:6 , ˆ\D1 ušfš;`:6—FšF`:6 ~uušF`:6 f' tJov "pJXW) "‰672.J^;œ;Mu, m˜l#p#Lp”    ` [...]... hỡnh, GV cht li: xuc - ch li ca ma sỏt Cỏch lm tng ma sỏt *H..4: VN DNG-CNG C (5 phut) 1 HS tr li cõu C8, c III Vn dng Vn dng: lp nhn xột C8: Yờu cu HS nghiờn cu C8 sau ú gi 1 em tr li, a Sn g, sn ỏ hoa khi a Ma sỏt ngh cú li : lau nhn (trn) F ms ngh cỏch lm tng F ms : chõn yờu cu lp nhn xột ớt chõn khú bỏm phi i dộp xp GV hi v yờu cu HS vo sn, d ngó , F ms ngh b F ms ln cú li: cỏch tr li cú li lm tng... ngt c vỡ mi vt u cú quỏn tớnh *H..4: VN DNG (10 phut) 2 Vn dng GV kt lun nhng ý HS suy ngh tr li cõu C6: chớnh v yờu cu HS ghi C 6 , C 7 , C 8 14 Trờng: THCS & THPT Hoành Mô Giáo viên: Vi Nhật Thảo C7: nh, nhc li C8: Yờu cu HS tr li cõuC 6 , C 7 , C 8 V nh: (1 phut) Hc thuc phn ghi nh, lm bi tp 5.1 5 .8 SBT, c thờm mc cú th em cha bit RT KINH NGHIM: ... 000(N/m 2 ), bỡnh, thnh bỡnh v cỏc vt p 2 =h 2 d=0 ,8. 10000 = 8 tronglũng nú 000(N/m 2 ) -Cụng thc tớnh ỏp sut cht S: 12 000 N/m 2 , 8 lng 000 N/m 2 -Nguyờn tc bỡnh thụng nhau C8: m cú vũi cao ng c nhiu nc -Nờu thờm phn cú th em cha hn C9: Da vo nguyờn tc bỡnh thụng nhau bit bit mc cht lng trong bỡnh khụng trong sut V nh: Hc thuc phn ghi nh Lm bi tp t 8. 1 8 6 (SBT) c thờm mc Cú th em cha bit RT KINH NGHIM:... lm cõu C9 cú li v F ms ngh phi ln Cng c: c Ma sỏt lm giy bỏnh xe bỏm vo mt - Cú my loi ma sỏt? mũn ma sỏt cú hi ng b mt lp phi Hy k tờn cỏc lc ma ễ tụ cú quỏn tớnh ln khớa rnh sõu, F ms cú li sỏt ú sinh ra khi no? hn xe p e Bụi nha thụng - F ms trong trng hp Xe p d thay i vn tng lc ma sỏt gia dõy no cú li ? Cỏch lm tc hn cung vi dõy n nh, F ms tng? cú li - F ms trong trng hp HS tr li cõu C9 C9:... cht tra d oỏn -Y/C HS rut ra kt lun,tr HS nhn xột, rut ra kt lng gõy ỏp sut theo li cõu C1 mi phng lờn thnh lun, tr li C1 GV kt lun ln cui HS nghe GV kt lun v bỡnh, ỏy bỡnh HS ghi bi C2 Cht lng gõy ra ỏp ghi bi sut theo mi phng -Y/c HS tr li C2 HS tr li C2 *H..3: TèM HIU V P SUT CHT LNG TC DNG LấN CC VT TRONG LềNG Nể (8 phut) HS nghe v quan sỏt GV 2 TN 2 V:Cht lng cú gõy trỡnh by v mụ t , ra ỏp sut... cõn A chuyn mt vt ang chuyn A tip tc chuyn ng ng qua l K thỡ A b ng m chu tỏc dng khi A b gi li c bit gi li Khi ú qu cõn A ca 2 lc cõn bng s tip giai on (d) hng dn cũn chu tỏc dng ca 2 tc chuyn ng thng HS ghi li quóng ng lc P A v T u i c trong cỏc khong HS da vo kt qu TN thi gian 2s li n tip in vo bng 5.1 v tr li cõu C 5 *H..3: TèM HIU V QUN TNH (10 phut) GV a ra mt s hin HS suy ngh v ghi nh II Quỏn... ntn? *H..6: VN DNG-CNG C-H.D.V.N (8 phut) IV Vn dng GV y/cu HS tr li cỏc cõu hi: C6: Vỡ khi xuụng sõu thỡ ỏp sut cht lng gõy ra cng ln, nờnnu khụng mc b ỏo ln C6, C7, C8, C9 thỡ con ngi khụng th chu c ỏp sut ny Y/cu HS khi lm bi nh lng thỡ phi ghi túm tt, i C7: Túm tt: Bi gii: n v nu cn ri mi c h 1 =1,2m, p sut ti ỏy v im gii h 2 =1,2 - 0,4 = cỏch ỏy 0,4m : Cng c: 0,8m, p 1 =h 1 d=1,2.10000 =12 -p sut... tc cú s li n quan no khụng ? GV a 1 s vớ d: viờn bi th ri, vn tc ca viờn bi tng nh tỏc dng no? Lm th no biu din lc tỏc dng lờn vt? *H..2:TèM HIU V MI QUAN H GIA LC TC (10 phut) GV nhc li lp 6 ta ó HS t nờu li khỏi nim lc Tỏc dng ca lc, ký bit lc cú th lm bin hiu, n v, ký hiu n dng, bin i chuyn v, l i lng vộc t ng ca vt HS t tỡm vớ d Yờu cu HS tỡm 1 s vớ HS tho lun theo nhúm, d minh ho tr li cõu... C2: Nc khụng chy ra khi 26 Trờng: THCS & THPT Hoành Mô -Y/C HS hot ng theo nhúm -Y/C HS rut ra kt lun, tr li cõu C1, C2, C3 -GV mụ t TN Ghờrớch v yờu cu HS tr li cõu C4 Giáo viên: Vi Nhật Thảo HS tin hnh TN, tho lun theo nhúm HS tr li C1, C2, C3 HS quan sỏt hỡnh v 9.4 , tho lun theo nhúm v tr li cõu C4 ng vỡ ỏp lc ca kh khớ tỏc dng vo nc t di lờn ln hn trng lng ca ct nc C3: B ngún tay bt u trờn ca... 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