Question

For a particle performing uniform circular motion, choose the correct statement(s) from the following:

1. Magnitude of particle velocity (speed) remains constant.
2. Particle velocity remains directed perpendicular to radius vector.
3. Direction of acceleration keeps changing as particle moves.
4. Angular momentum is constant in magnitude but direction keeps changing.

Answer 1

a, b and c

Explanation:

For a particle performing uniform circular motion.

1. Speed will be constant throughout.
2. Velocity will be tangential in the direction of motion at a particular point.
3. Acceleration `a = v^2/r` will always be towards centre of the circular path.
4. Angular momentum (mvr) is constant in magnitude and direction/out of the plane perpendicularly as well.