work energy principle applicable to which motion
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The Work-Energy principle states that the total work done on or by an object is equal to the total change in energy between the given initial and final states. ... As it slides down the rough slope, the friction force does work against the motion of the box.
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WORK IS CLOSELY RELATED TO ENERGY. THE WORK ENERGY PRINCIPLE STATES THAT AN INCREASE IN KINETIC ENERGY OF A RIGID BODY IS CAUSED BY AN EQUAL AMOUNT OF POSITIVE WORK DONE ON THE BODY BY RESULTANT FORCE ACTING ON THE BODY.
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