Circular Motion Acceleration – Rankers Physics

Uniform Circular Motion: Practice Problem & Solution

Assertion (A): In circular motion acceleration is always towards centre. Reason (R): In uniform circular motion velocity is constant.  
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Short Solution (Best for NEET):

To solve this problem, we apply the core principles of Uniform Circular Motion. Understanding the underlying formula is key to arriving at the correct answer below:

In circular motion, centripetal acceleration is always directed towards the center. So (A) is true. In uniform circular motion, the speed is constant, but the direction of velocity changes continuously, meaning velocity is not constant. Hence (R) is false.

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Similar Practice Questions

Explore conceptually related problems to test your knowledge.

1. Assertion (A): In uniform circular motion, angular acceleration is zero. Reason (R): In uniform circular motion, acceleration is constant.  
2. Two bodies of masses 10 kg and 5 kg moving on concentric orbits of radii R and r such that their period of revolution are same. The ratio of their centripetal acceleration is :
3. Assertion (A): A body having uniform speed in circular path has a variable acceleration. Reason (R): Direction of acceleration is always away from the centre.  
4. The kinetic energy \((K)\) of particle moving along a circle of radius \(R\) depends upon the distance covered \(S\) and is given by \(K = aS\) where \(a\) is a constant. Then the centripetal force acting on the particle is:
5. A stone of mass m is tied to a string of length l and rotated in a circle with a constant speed v. If the string is released, the stone flies :