What does it infer when it is asked to find work done by a body on another body?
MIT 8.01 Physics I Classical Mechanics, Fall 1999
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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?
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.