本题目来源于试卷: newnewnewnew，类别为 IB物理学
[问答题]
(a) A box sits at rest on a pm8ie287js*/lw fu u5; d,lj3ebpmg qrk hjtwy.e5di* j2xg 6/ough 30$^{\circ}$ inclined plane. Draw the free-body diagram, showing all the forces acting on the box.
(b) How would the diagram change if the box were sliding down the plane?
(c) How would it change if the box were sliding up the plane after an initial shove?
参考答案: 
本题详细解析:
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