When the motor is standing still, each scale reads the same 15 points. When the pulley turns in a clockwise direction, the friction between the belt and the pulley makes the belt try to move with the pulley. Therefore, the pull on scale A will be greater than 15 pounds, and the pull on scale B will be less than 15 pounds. This counter will record the number of turns the shaft makes per minute. You know that the motor is exerting a force of 20 pounds through that distance.
Power is the rate at which work is done.
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