Body P rests on body Q on horizontal ground. Weights are Wp,Wq, all contacts are frictionless and the system is at rest. R denotes the interbody reaction. Which is P’s correct free-body diagram?
Isolate P only. Its weight Wp acts downward and Q exerts an upward normal R. Static balance requires R=Wp. Q’s own weight acts on Q, not directly on isolated P. Thus the diagram containing only Wp down and R up is B.
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