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i{ DE - rHt HK I (2oro _20111 Ll
r vAr lf ro co aeil
tuoN
rHiii'dnx oo F[oT.-'
CCu Dlnh luQt vgn vflt h5p din:
ph-5t bi6u dlnh tuft
: vi6t cong tfo-c c0a dlnh rult, n6i 16 i nghia vi don v! c0a t&ng dqi tugng
C6u - Th6 nio li hai lr,rc cin blng?
- vb hai tr,rc cin uing Trong va chgm giri'a b6ng vi sin vi lpc cria sin tic dgng vio bong sao?
Cilu Dinh nghia chuy6n dQng rron
hudmg tflm?
cdu 4 -Nau dlnh nghia momen ryc ,vi& bi6u thrbc tinh momen lrc
-cdnh toy itbn cfia lyc ld gi ? Khi ndo thi lyc tdc dyngido vQt cd _!Ug qaay cO ainn khilng tdm vQlquay ? ' -o
' CduS i
-.a Thd nio li chuydn dQng th8ng b Neu tinh chdt chuydn dQng cfia
ri =5+l0r*S,5r: (x : ffi,t:^s)
x?= -l0r -i (x: m.t: s\
nha thi l$c c0a bong tic dung xu6ng sin
c6 phii li hai lpc cin blng kh6ng? Tei diru? NGu dtc rli6m vi c6ng thrtc cria gia tiic
nhanh ddn ddu, rhfrng chflm ddn ddu? mSt v0t dtrgc cho bdi cdcphuong trinh sau:
C€u
MOt vft chuydn.IOng ddsc cho bdi dd thi nhtf hinh v6.
a Neu tinh chdt chuydn dQng vi tfnh vfn tdc cria vft?
b viet ptrddng trinh chuydn dOng *ila vfr?
cdu 70 M0tp-to c6 khoi lugng 800 kg dang
gia tdc m/s2 Luc Fdo $qns co eeira c6
xe vi m?t dudrng ln bao nhibu? -pnat Uicu diAu kipncan Uing cria vft
c6 tryc quay cO ainn vd didu kiQn c6n beng cria
vft c6 m4t chdn d6?
' Ceu !- MOt v$t go tctrOi tuqng 4kg bet ddu truqt tr6n sdn nhi du6i t6c dune cta m6t tU r{,r.gqe
!h.g 20N Ue 16 ria s6t t*"t eitr r4r ra .a" fa O,ii, ia], fir;i"'
a Tinh d0 lon lgc ma s6t trlc dpng vio v4t? - -,
b Tinh gia t5c eta vft?