Physics · Work, Energy and Power
A ball is made to move uniformly along a horizontal circular path. The work done by the centripetal force providing the horizontal circular motion for one complete revolution is zero because:
- 1there is no net gravitational force acting on the ball in the horizontal plane
- 2the centripetal force is always perpendicular to the instantaneous velocity of the ball✓
- 3there is no friction or dissipative force acting on the ball
- 4the average force acting on the ball over each revolution is vectorially zero
Correct answer
the centripetal force is always perpendicular to the instantaneous velocity of the ball
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