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admin 发表于 2024-10-9 22:51:33 | 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]
A box rests on the (frictionless) bed of a txudn a i-3w1b 3um5pq2ruck. The truck jy,2t lhm4)z tdriver starts the truck and aclmt 4z2,h )jytcelerates forward. The box immediately starts to slide toward the rear of the truck bed. Discuss the motion of the box, in terms of Newton’s laws, as seen (a) by Mary standing on the ground beside the truck and (b) by Chris who is riding on the truck







参考答案:
(a) Mary sees the box stay stationary with respect to the ground.  There is no horizontal force on 
the box since the truck bed is smooth, and so the box cannot accelerate.  Thus Mary would describe the motion of the box in terms of Newton’s 1$^{st}$ law – there is no force on the box, so it does not accelerate.
(b) Chris, from his non-inertial reference frame, would say something about the box being 
“thrown” backwards in the truck, and perhaps use Newton’s 2$^{nd}$ law to describe the effects of that force.  But the source of that force would be impossible to specify.



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