Question 224: Work, Energy and Power & Circular Motion

Question

A particle is moving in a circle with uniform speed. It has constant

Accepted Answer

A particle moving in a circle with uniform speed has constant
kinetic energy
.
When a particle moves in a circular path with constant speed, the magnitude of its velocity remains unchanged. However, the direction changes constantly, which means that the particle is accelerating towards the center of the circle. This acceleration is called centripetal acceleration. Therefore:
Velocity
is not constant because its direction changes continuously.
Acceleration
is present because of the change in direction, but it is not constant because its direction continually changes along the circle.
Kinetic energy
is constant as the speed (magnitude of velocity) is uniform. Kinetic energy is given by the formula:
$$ KE = \frac{1}{2} m v^2 $$
since the speed $v$ is constant, kinetic energy is constant.
Displacement
is not constant because the particle continues to move around the circle.
Hence, the correct choice is
Option C: kinetic energy
.

Answer

velocity.

Answer

acceleration.

Answer

kinetic energy.

Answer

displacement.

Work, Energy and Power & Circular Motion

A particle is moving in a circle with uniform speed. It has constant

Choose the correct answer: