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Space Time & Motion A.2 Forces & Momentum (id: fe2592b42)

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admin 发表于 2024-2-9 18:41:07 | 显示全部楼层 |阅读模式
本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum,类别为 IB物理学

[单选题]
An apple falls 5 m in height from a tree. It rebounds fr02ibueqrp-w .38 t.+yopv;lxo )fkreom the ground ud,n av 8.ij6szj)w i3with a quarter of its striking speed. The apple is in contact wid6)a.8ju in3vizw , jsth the ground for approximately 0.1
s. What is an estimate of the magnitude of the average net force on the apple when it strikes the ground?

A. $10^0$N
B. $10^1$N
C. $10^2$N
D. $10^3$N


参考答案:  B


本题详细解析:


Speed of the ball v just before the hit;

mgh=12mv2

v=2gh

v10ms1

The magnitude of velocity just after the bounce back;

v=2.5ms1

The estimated mass of an apple is 0.1 kg.

Change in momentum;

Δp=p2p1

=(mv4)mv

=m5v4

=(0.1kg)((5)(2.5)4)ms1

=1.251.0×100kgms1

Duration of the collision is 0.1 s.

Force;

F=Change in MomentumTime=1.0×100kgms11s=1.0×101 N

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