[請益] F=ma 問題
題目如下:
M物體的質量5kg，不計空氣阻力及地面磨擦力，
則下列何種情況，M物體的加速度最小?
A) B) 10kgw
^
M--->10kgw |
M
C) D) o----M
|\------
10kgw<---M || 水平桌面
砝碼囗|
10kgw
我的想法如下: (a=F/m)
AC 10*g/5=2g
B (10-5)*g/5=g
D 10*g/(10+5)=2g/3 (g為重力加速)
所得D最小
可是答案為B
請問哪裡出了問題，還是答案錯了?
謝謝!
題目圖:http://ppt.cc/D0Bq
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