2019-2020
1 O F1F2F3 F1y F2x
(90)
AF3
BF3
CF3F2 F3F2
DF1F2 F1 cos
2 3N 4N
A 3N B 5N
C 7N D 8N
3
0.4 F=0.04N.
g10m/s2 0.01kg ( )
A8m/s2, B0
C4m/s2, D4m/s2,
4 (g=9.8m/s 2)
A 9.8m/s
B
C
D
5 ( )
A
B
C
D
6 x
x
g10 ms2 ( )
