Work Done :: Discussion


1.A particle is acted upon by a force of a constant magnitude which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that ?
A.Its velocity is constant and kinetic energy is constant
B.Its acceleration and velocity is constant
C.Its kinetic energy is constant and it moves in a circular path
D.Its acceleration is constant and it moves in a circular path
Answer:  Option  C
Explanation:

For a particle in uniform circular motion, the direction of both velocity and acceleration vectors change continuously but their magnitudes remain unchanged. The kinetic energy is not affected. Hence its kinetic energy is constant and it moves in a circular path.

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Published by:Michael Daani

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