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12008 A D B C



A B C D D

2 A C B

D

B

3 10cm 100N 12cm 200N A16cm D19cm B6cm C14cm

10cm 100N 12cm 100N 2cm 1N 0.02cm 200N 4cm 12cm 16cm C 42012_____ _____N

: 1 26 1N 5 0.2N 0.2N =1N+0.4N=1.4N 261.4 5: 12 _________cm ________N

1 1mm 3cm 3.20cm 3.21cm 2 0.2N 2N+0.2N 4=2.8N

3.202.8 6 2007 _________N_________

--- 5N 0.2N 2.6N

2.6

7: F A F _________N

3.6N F n=3 F 0.2N 3.6N n=3 F=3.6N/3 =1.2N 1.2


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