Assertion: For uniform circular motion it is necessary that the speed of the particle is constant.

Reason: There is no tangential force or tangential acceleration acting on particles in a uniform circular motion.

Assertion: Acceleration of the particle in uniform circular motion remains constant.

Reason: The velocity of the particle doesn’t change in a circular motion.

Assertion: When a car turns around a circular path it is acted upon by a centripetal force.

Reason: The friction acting on the wheels of the car provides the necessary centripetal force.