试题与答案

如图所示,在孩子与爸爸“掰手腕”的游戏中,下列说法正确的是 A.爸爸“掰倒”孩

题型:选择题

题目:

如图所示,在孩子与爸爸“掰手腕”的游戏中,下列说法正确的是

A.爸爸“掰倒”孩子时,爸爸对孩子的力大于孩子对爸爸的力

B.爸爸“掰倒”孩子时,爸爸对孩子的力等于孩子对爸爸的力

C.孩子“掰倒”爸爸时,孩子对爸爸的力大于爸爸对孩子的力

D.孩子“掰倒”爸爸时,孩子对爸爸的力小于爸爸对孩子的力

答案:

答案:B

题目分析:因为物体间力的作用是相互的,所以在孩子与爸爸“掰手腕”的游戏中,不管是爸爸“掰倒”孩子还是孩子“掰倒”爸爸,爸爸对孩子的力等于孩子对爸爸的力,之所以被拜倒,是因为对方的承受力不同.

故选B.

点评:此题主要考查力作用的相互性这一知识点的理解和掌握,此题容易错选AD,误认为拜倒对方是因为力大的原因,这是对“力作用的相互性”这一知识点理解的不够透彻;如同拔河比赛时,对方输了,不是力小的原因,主要是承受力不同.

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题型:阅读理解
Smiling
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