Explain why is the force in each problem not doing work

Reference no: EM13508180

When is there no work on an object. For example, a weightlifter picks up a weight, or a kid wearing skates pushes of a wall and moves in the opposite direction. Why is the force in each problem not doing work? I always thought that if the force is in the same direction as the displacement of an object then that force has done work.

Reference no: EM13508180

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