What does it infer when it is asked to find work done by a body on another body?

Question

owlfred · Answer

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sandra · Answer

Actually the question is that a child goes down a slide, then what is the work done by the slide? Is it asking the work done by the normal reaction on the child?

anonymous · Answer

The normal force does no work because the dot product of F and dx is zero (there is no motion in the direction of the normal force.)  Consider friction, however. It is in the direction opposite motion.

anonymous · Answer

since the friction is zero w=f.ds become zero .

anonymous · Answer

The work done by the slide is the work due to the friction force