1、 1 1 A B A B A B 1 M A B F A B B m a F A.B.C.D. 2 2 1 A. B. 1 C. 2 D. 2 2 2 M m a a g A. Mg + mg B. Mgma C. Mg + ma D. Mg + mg ma 3 m M A. B. C. D. 4 30 4N 4N A.4N B.2 N C.0N D.3N 5 A B mA=0.2kg mB=0.4kg C mC=0.6kg O O A aA B C FBC g 10m/s2 1 M P m P F ABCO F= F= F= F=2 A B m1 m2 F A B f= f= FAB= FA
2、B=3 a A a B c C D b 4 , M, , m , ( )A. , B. , C. , D. , 5 A B C B F A B B A C A. B. C. D. 6 3 M m M m A. M B. M C. m D. M 7 M 8kg F 8N 1.5m/s m 2kg 0.2 t 1.5s .(g 10m/s2)8 6 A C Fabc B 9 10 M C m A B A B F A B F 10 M 4.4 1. 2. 3. 1. A B m1 m2 A F A B A. B. C.F D. 1. m1 m2 B 2. m1 m2 F m1 2. M m 1 2
3、1. A B F a A B mA mB F A B A.0 0 B.a 0C. D.a 2. A B C F Am2m1 m2FA BFm1VA BF B F A B f1 B C f2 f1 f2 A.f1 f2 0 B.f1 0 f2 F C.f1 f2 D.f1 F f2 03. 0.8 g 10m/s2 4. M 5.0kg 0.22 m 1.0kg F 30 F g 10m/s2 1. M m A B A A B 1 2 A B B A. B. C. 1mgcos D. 2mgcos 2. M m A.g B. C.0 D.3. F A B C B F Fa Fb A.Ta B.T
4、b C.Ta D.Tb 4. “ ” M m a “ ” A. M+m g B. M+m g ma C. M+m g+ma D. M m g5. FCB FmMBA aABCTa TbMmF A. B. C. D. 6. A B C 1:2:3 C A B aA= aB= 7. 45 A P m a a 2g F 8. m 2m A B A B A A B A B A B FA FB 9. 80kg 600N 10. mo m L L ABCaPA45ABF M 1. A B A B A B F m1+m2 a A B FN B B A B FN A F FN m1aF FN FN A B F
5、 m1+m2 g= m1+m2 a B FN m2g m2aFN m2g m2 m2 FN m2gsin m2gcos m2a 2. 1 F Mgsin F mgsin +F ma a a 2 a mgsin F Mgsin +F=Ma a 1 M+m gsin /m 2 M+m gsin /M 1.D 2.C3. m mg=F F F FN FN FN ma 4. mgtg =ma F (M+m)g=(M+m)a F 48N 1.BC 2.D 3.A 4.B 5.C 6.0 7.g 8. F A A B B mg=2ma FA (m+2m)a F B A B A mg ma FB (m+2m)a FB 3mg FA:FB 1:29. Mg N Mgsin Ma a=gsin a f macos mgsin cos mg N masin mgsin2 f mgNaxaya N mg mgsin2 =mgcos2 cos 30 f mgsin cos f 346N 346N 10. kL (m+m0)g L k(L+ L) (m+m0)g=(m+m0)a FN mg=ma FN mg+ma=mg(1+ )
