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admin 发表于 2024-10-10 22:49:29 | 显示全部楼层 |阅读模式
本题目来源于试卷: newnewnewnew,类别为 IB物理学

[问答题]
When you stand still on the ground, jgmiiwlc o no *q;np,y/m.4,b1;z3ne how lsq6- se*5vt* mun*w glarge a force does the ground exert on you? Why doesn’g-nqvmuw6 *l**sts5et this force make you rise up into the air?




参考答案:
If you are at rest, the net force on you is zero.  Hence the ground exerts a force on you exactly equal to your weight.  The two forces acting on you sum to zero, and so you don’t accelerate.  If you squat down and then push with a larger force against the ground, the ground then pushes back on you with a larger force by Newton’s third law, and you can then rise into the air.


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