Assertion : Linear momentum of a body changes even when it is moving uniformly in a circle.
Reason : In uniform circular motion velocity remain constant.

Assertion : Linear momentum of a body changes even when it is moving uniformly in a circle. Reason : Force required to move a body uniformly along a straight line is zero.

What remains constant in uniform circular motion ?

For uniform circular motion, the quantity that does remain constant is

Assertion (A) The speed of a body in uniform circular motion is constant. Reason ( R) In uniform circular motion, the acceleration of the body is constant .

(A) : Force is required to move a body uniformly along a circle. (R) : When the body is in uniform circular motion, acceleration is zero.

Assertion : A body may be accelerated even when it is moving uniformly. Reason : When direction of motion of the body is changing then body may have acceleration

Assertion : Force is required to move a body uniformly along a circle. Reason : When the motion is uniform, acceleration is zero.