1. 塀 犖 F 1 犖 5
40201 犖 犖 F 5
( 犖F )
犖 4 15
F犖 F 5 犖 犖 犖
犖犖 犖 ( X ) 犖 犖, , F 犖 F
1. F 2 F犖 犖 犖 F犖 FA 犖 F FB 犖 F 犖 F
FB 犖 FA F 犖
1. 犖 B 犖犖 F A 犖
2. 犖 F B 犖犖 F 犖 F A
3. 犖 FB 犖 F 犖 F FA
4. B 犖犖 F A
1
5. 犖 犖 (F )
t
犖. 2, 3, 4, 5 . 1, 2, 3, 5 . 1, 2, 3, 4 . 1, 2, 3
2. 犖犖 犖 犖 F 犖 ( 犖 1 3) F
F (kg.m/s)
F (N)
犖. 20 kg.m/s
10
. 15 kg.m/s
5
. 10 kg.m/s
t (s) . 5 kg.m/s
1 2 3
3. 犖 F 2 犖 F F犖
犖. 10 N . 5.0 N . 2.5 N . 0.5 N
4. F 犖 m F 犖 F u 慮 犖 F 犖 F 犖 F t
犖 犖
2mu cos慮
u 犖.
t
慮 . 2 mu cos 慮 . t
慮 . 2 mu cos 慮 . F
u
. 2 mu cos 慮
2. 5. 犖 犖 0.5 kg F 犖 F 20 m/s F 犖
F F 犖 犖 F 20 m/s F 犖 F 犖 犖 0.05
1. 犖 犖
2. 犖 F 犖
犖. 犖 = 5 kg.m/s = 100 N . 犖 = 10 kg.m/s = 200 N
. 犖 = 15 kg.m/s = 300 N . 犖 = 20 kg.m/s = 400 N
6. F 犖 0.6 kg 犖 20 m 犖 犖 F 犖 犖 犖 F 5m
F F F 犖 犖 犖 犖 F F 犖 3.05
犖 F 犖
犖. 460 N . 360 N . 250 N . 150 N
7. 犖 犖 F F犖 犖 F
犖. . F . .
F F F 8 -10
2犖 犖 犖 F F 6 F 犖 犖
0.2 F 4.5 F 犖N
P1 W E
8. F F犖 F P2
S
P
P P P
犖. . . .
9. F . ( N.s )
犖. 犖. 15 . 12 . 6 . 3
10. 犖 F 犖
. 犖. 150 . 120 . 90 . 75