2019-2020
1 ( )
A
B
C
D
2 AB m
A=1kgm
B=2kgAB
=0.2 F=3N B a1a2 AB
f AB
Aa1 =1m/s 2a2=1m/s2f=1N
Ba1 =1m/s 2a2=1m/s2f=2N
Ca1 =2m/s2a2=0.5m/s 2f=1N
Da1 =2m/s 2a2=0.5m/s 2f=2N
3 m
A cos
mg
B sin
mg
C
D
4 m A M B F
AB ( )
AB
BAB
CBA mg
DBA mg
5 0.02s 5
