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Jtrg trttdckhi t6i vflt ciin.. Luc cA giasgng song v6i tnlc,euaV.[r]
(1)lo(.i
t;, i.,,) ia
KHEVg TRA 45' LAN X E{K EH
vr$T H,V xo NAmc cAo
vflA mn x02
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cfiu I: chon phat nidu ddng DOng ndng cfia mot vilt t6ng gdp bdn khi: A van t6c cfra vat tHng gdp doi B van tdc ofia vQr g!6nn hai !Sn
c; van tdc cria v'at tdnE gd'p bdn .D v&n tdc crja v6t gi&nn bdn ldn" C6u 2: Mdt vat dang drlng yan; fi,c clqrng vho vflt m.6t lgc F c6 gid di qua rfgng t6m c;a
v8r rhi 'rAt d6 s6:
A Chuydn dQng tinh ri€i"r E Chuydn dOng quay
c*u s: $d$!vpt co khOi luEng m chuy€n d$ng vfi van toc:31'n/s ddn va cl.r+rn v#i m+t
vat co kh6! lwEng'Zm $an$dwng yen Sau-ua cham, 2v€etdlnh v&o vd c,,,rnie
chuydn drlng vcvivan tOc bao nrri6u? coiva chqm gia;a}vat a u,
"h;;;A;
-='.
A" 2mls B 1,5 r,n/s e.3m/s D lmis
C*ar 4: t{ai vflt cd cung khOi iuqng m, chuyCIn dQng vdi vqn t6c cd dq ldn h5ng v1
: ri2 F.)6ng iugng cria hQ hai vpt s6 du-ry c tint-r theo bi6u thric ndo sau ddy ?
-A" p=Zrn\ E.:p=Z*i, C.'p=*a+*i) D i=.*(r,.+yrl
cfiu s: Khi mOt vat chuydn dOng trong trgng t!.udng theo m0t duong cons
krn thi c6ng cfra trpng lgc
A co Eia tri dutOng
E, cd gia tri arr, "
p,chUatinhdUdcvichrJabidtchie.uddidudngcongd6
Cflu 6: Tai sao ci{i cd-l€ (dUng cu chuy0n dd m& 6c v{n b cdc bO phan cria xe) lai cri phdn cdn dli?
A-D{ tang db bdn ctra dung cu B Dd ring m6men ctra luc
c Dd ang dQ tr6m ciia luc D Dd tan! v6 rhdm mf, r, Cf;u 7: NhQn x6t rrho sau dAy vd ng6u luc lh khOng chinh x6c ? :
a- Hq-p luc cria ngSY luc bang vi hai lrlc d6 song song, ngrl-o c chidu cing d0 i6n B NgAu luc lh h0 gdm hai lrrc song song, ng&oc Jni6u, cO Eo tO., bing nhiu, v) cirng
t6c dung vi.o mOt v6t
T'rang l14 - Md,eA tn; 102
(2)C MomEn cfra ngdu luc tinh theo c6ng thrlc : M = F.d ( trongd6 d la c6nh tay dbnictia '
"n.I.ighu
luc lu6n lhrir cho v6t quay, mi6n ld truc quay vu6ng g6c vdi r4at phing chfia ng5u h-tc,
Cflu 8: MQt v$t c6 kh6i luqqg m: 50g chuy6n dQng thang i16u;6i vfln t6c 50 cm/s thi
{} dgrng luqng cta vflt cg d0 l6n la
a ZSOO kg.mis s 0,OZS kg.m/s C" 0,25 kg.m/s , D.2,5 kg.m/s
Ciu 9: Hai luc cira ngSu,luc c6 dQ lon F = 20N, khoing c6ch gifia hai gi6 ctra ngSu luc
lh d = 30 cm OOi yOi trqrc quay vu0ng goc.voi m6t phing chrla ng5r,r lr/c:thi
rn6men cria ngSu luc lh:
A.M=0,6(Nm) E.M=600(Nm) a.M=6(Nm), D.NI=60(Nm).
Cfru tro: Chqn cAu ph6t bidu dring: C8n bire bdn lh loai cAn bing mh tai vi tri c6n baag
v0t c6 tem
I A thip nhAt so vdi cdcvi tri lxn eqn E cao nhdt so v1i cdcvi tri lAn cfln.
C cao b4rg vdi cdc vi tri lfln c0n D bdt ki,so vdi cdc vi trf lfln c6n
Cfiu ln: DQng luqmg cria vf,t b6o todn trucrng hqrp ndo sau ddy ?
a Vflt dang chLtyCn dQng thing dAu tr6n mat phdng nim ngang
ts V4t dang chuy€n dQng trdn d6u c Vit O*E
"frrVg, Oi,rg rfr*f, O,an q0u tr6n mflt phpnenim ngang khOng m a sht D Vat dang chuy€n dQng chflmddn d0u tr0n mptphlirg nim ngang kh6ng ma s6t
"Cau 12: MOt vdt dang drlng y6n thi chiu tdc dung cira luc c6 dQ lfu khdng ddi F lAni vfi,t chuydn dQng vi dat vAn t6c v spu khi di hOt doan drlong s Ndu h,rg tric dgng c6 dQ lcrn
}<hdng ddi le 3F thi vQt d4t vfln tdc bao nhieu sau khi di hct do4n dilongls : '
c6tu tr3: MQt vAt g6n vao ddu N cria lo xo ddn hdi c6 dQ crfng k = 200 N/rn
dLfqc ddt tr6n mqt mdt ph&nE n5m ngang, ddu kia(ddu M) ctia Io xo cd
d!nh Chidu ddri td nhi6n cria ld xo b,ing 30 cm Chqn gdc thd ndnE tai vi tri
ld xo khonE bi6n dang Ddy vat vd phfa ftl sao cho chi6u rldri ld xo chi con
lai lA 25 crn; Thd nEng ddn ndi cria vat tai vi tri d6 la \
Fr, 25C ffi"j m,2500 *J
(J rQ
.-, b ,{L 4l
c" 250 J Cfiu x4: CO ndng cria vpt ld
a m6t dai lugng vd hudnE lu6n kh6ng ddi.
B" mQt dai lugnE v6c td
e mQt dai hlQng vo hUdng luon luon dddng
,D.mQtdailuqngvohUdngc6fhd&m,dUdngho{ebing0
C&u ts: MQt ot6 c6 khdi lgng 1600kg dang ch4y v6i v{4 t6c 50km/h thi ng&di I6i nh)n th0y mdt vAt c6n trudc mdt c6ch 6tO khoAng 15m Ngudi dd tit m6y vi hdm phanh
khdn cdp Giri srl fgc hdm 6t0 kh6ng adl va bang 12 000 N Xe 6td s6:
a va cham vho vdt cin E Jtrg trttdckhi t6i vflt ciin ' 'f,, c dtrng 's6t v&t cin D, dtng c6ch v0t can dring m *
cfiu 16: Khi xdy nhA, ngwcvi ta thucrng dao m6ng r6t sfiu vd d6 mong rAt n5ng,
de lam gi?
A.d9 hathdp trgng tilm,tdngclQ virng vang cho cdn nhd
m, dC tdng diQn tfch ch6n d5, tang dQ vffng vang cho cdn nhd
Tiang?/4 - rraa O0 thi 102
(3)&I' F"
\ C d6 mua n6ng kh6ng ldm mpc m6ng nhd D dC hA ri6ng
"uo t qrg ldm,inngdgirfnrg vang cho cdn nhd
Cffu 17: Dudi tric dgng cria mQt lpc kh6ng A6i bang N, mQt vflt thu gia tdc vi chuy6n
dOng Trong thli gian Z s , dg Ui6n thi€n d0ng luq,ng cfia vQt ld
^4 kg.m.s 8.6 kg,ms c-ZUg, tt S 8 N.s trl
Ciu 18: Ba luc ddng qqy tdc dUng lOn vAt ran c6n O*, c6 dQ tcm idn lo le 12N, t6N va
"l-20N Ndu luc 12i{ kh6ng t6c dung vho vAt nfia tfri hqplgc tdc dung l6n vflt c6 dQ I6n l}: S
e 16N 8.20N c 15N D 12N
Cfiu 19: MOt dm vfunryd\e48N dugc b6c qua mQt bC nudc Trgng tdm ctntdnvdn circh
rli0m tiia P 1,2 m vir"art aic* ru; e 0,6m .r1l" rna r5* rd #r 6ng're; aiA;iu, l,
,)
bang
C6u 20: KOt lu6n nho ddi d.ay vd didii ki6n c6n b6ng cfia m6t vit rin chiu tdc dung ciia
ba luc khdng song song li ddy dfr?
A ba h,rc d6 ph6i ddng phing vi ddng quy E ba luc d6 phii ddng quy
c ba luc d6 phAi ddng ph&ne
n hqpiuc cira hai hlJbet k)"ph6i cAn bang v6i luc rhrl ba
CSu Ztr:: C6n dia ld m$t,img,dqng cfi,a s,
c" elinh ly dOng n5.{8 D" <linh luat b6o todn elOng luo ng
A" C6'ng crla trEl'lg luc bing hiQu thd ndng treng trudnE cfra vat'' tAi"vi tii ' cuoi va tal vi tri ddu.
B Trong IUc sintr c6ng dmkhi v6t rol t& tr6n cao xudng thdp
C Trqng ltJc sinh cOnE drJdng khi dua v&t ttJ thdp l6n caol
m" C0nE cfra trq:nE luc chi phg thuQc vi tri ddu vii cudi cfia quf dAo
cdu zs: Scyrr v! ndo sau d*y kh6ng phdi la dcyn v! ct}a c6ng sudt ? n .,1.s E" m5 !Uc c Nl.m/s D W
cffu 24: KhAu sring d4i bScn{ng M : 0,5 tfrn dangdung ydn tr6n mat phdng nim ngang, cd ndng sfing nirn ngang, bin ra nrQt vi6n dpn k[oi luqng m: I kg bay vJi vgn t& vl
500rn/s(sov6id6t).B6quamas6t.V3rrt6cg.ifltliricriaifn8ld-A" 0,5 rrils B m/s C.250 m/s B 1000 m/s
Cf,u 25: tr-uc nlo khidn cho cdchlnh tinh chuydn dQng quanh Mat Trdi?
A trong iuc n h.rc dhn hdi C.lgc hap d5n n.lgc ma s6t
Cfru26: Trong IoBi chuy6n dQng ndo thi vQt cb tlQng n6ng vd c10 lon <lQng lugng khOng
r16i cdn vectcy ddng lyong ludn bi6n il6i theo thoi gian?
a chuyfn dOne"thingldy ts chuy6n dQng rrdn d6u
C" chuy6n dQng thhngUi€n OOi Oeu o chuy6n dQng roi tg do, ,r
cfrw2TzFlai chi em dirng mQt chi6c eay dc khiCng mQt bao"g4o c6 trgng luqng 1000N
Ed gi6m bo't stic n[ng cho chi ndn ngudi ern dd treo b.ao gpo cdch vai minh 36 cm vd
cilch vai chi 54 cm F{6i llrc ctia g$y dd l6n vai em nhiAu hcrn h;c cria gQy dd l€n vai chi
Ia bao nhi€u ?
A.600 i-.1 B" 4A01.-l c.200 hl B 300 ]N
\
(4)c6u 28: MQt nguoi k6o mQt thtng 96 truEt th5ng clAu ti6n san nha nlm nq19
;iil"i ;,iv rrop uoipr'""ns ng#d goc io" u*i ngwdi d6 k6o diy tjins 150N C6ng,cfia lwc ma sdt thirng truqt tfwgclQm la :
- - I
'
n._z,sgalB.-300bJ c.2.598J
-': -_- .:: -
-
Ciu 29: O truong hgp nbo sau d6y,lgcrc6 tdc dung lhm cho v{t r6squay quanh trqc?
A Lrlc c6 gi6 c6t trgc guaY:
B Luc cA giasgng song v6i tnlc,euaV :
^
C Lgc cOlia"ar"'tron"g m4t phing vuOng g6c v6i trgc quay vd khOng cit truc quay D Lqc cO lia nam matbhanE wong g6c'v6i truc quay vh cit tryc qyay
cffu 30: DQng ndng c&a'''v&t t6ng :
ffi" C ac, iqfc tac dUrig Ien
c Gia tdc cnia vAt tfrnE ffi" Cac nLrc td:e dq;ng I,8r:
vfit sinh cong
I,
corlg dtfdng
vat .l stnl"t
fr
ft" -[6
.F
B
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