An Object Moves in a Circle at Constant Speed

question 31

Multiple Choice

An object moves in a circle at constant speed.The work done by the centripetal force is zero because:

• A)the displacement for each revolution is zero
• B)the average force for each revolution is zero
• C)there is no friction
• D)the magnitude of the acceleration is zero
• E)the centripetal force is perpendicular to the velocity