State two conditions when no work is done by a force.
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1. WHEN FORCE IS PERPENDICULAR WITH MOTION.
2. FOR CIRCULAR MOTION CENTRIPETAL FORCE ALWEYS ACTS AT RIGHT ANGLES TO THE MOTION. IT CHANGES DIRECTION OF THE MOTION BUT NO WORK DONE IS TAKEN PLACE.
2. FOR CIRCULAR MOTION CENTRIPETAL FORCE ALWEYS ACTS AT RIGHT ANGLES TO THE MOTION. IT CHANGES DIRECTION OF THE MOTION BUT NO WORK DONE IS TAKEN PLACE.
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