在平直的公路上,骑自行车与步行相比,A同学认为骑自行车既省力又省功；B同学认为骑自行车省力但费力 要求分析那位同学正确用画图的方式分析,表明力臂和力
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在平直的公路上,骑自行车与步行相比,A同学认为骑自行车既省力又省功；B同学认为骑自行车省力但费力 要求分析那位同学正确用画图的方式分析,表明力臂和力
在平直的公路上,骑自行车与步行相比,A同学认为骑自行车既省力又省功；B同学认为骑自行车省力但费力 要求分析那位同学正确
用画图的方式分析,表明力臂和力
在平直的公路上,骑自行车与步行相比,A同学认为骑自行车既省力又省功；B同学认为骑自行车省力但费力 要求分析那位同学正确用画图的方式分析,表明力臂和力
A同学是对的.
骑自行车，是省力，步行费力。
这个要作图的，力臂，力矩。
另外，他们是不会省工的。最终他们用的功，肯定一样。因为能量守恒。
d
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