Question

 The force required to keep a body in uniform circular motion is ________.
A. centripetal force
B. centrifugal force
C. resistance
D. None of these

Answer 1

Hint:
A body moving in a circular pattern is said to be in a circular motion. A particular kind of circular motion called uniform circular motion involves a body moving along a circular path at a constant speed. The body has a fixed central point and is always equally far from it.


Complete step by step solution:

In the question we have been asked about the force that is required to keep a body in a uniform circular motion. A body is said to be in a circular motion when it’s traveling in a circular path. Circular motion is of two types, one is called as non-uniform circular motion and the other is called as the uniform circular motion. In uniform circular motion the body covers equal distance in equal time and moves with a constant speed. A free body diagram of an object in uniform circular motion is shown below:

Here ${{a}_{z}}$is the centripetal acceleration, \[v\] is the velocity with which the object is moving and $r$ is the radius of the path. In uniform circular motion only centripetal force is applied as the object is moving with equal speed then the tangential force ceases to zero.
Centrifugal force: When observed from a rotating frame of reference, the centrifugal force, which is an inertial force, appears to affect every object. It is pointed away from the origin of the coordinate system, along an axis that is perpendicular to the axis of rotation.
Hence the correct option is A. centripetal force





Note:
 The thing to remember is that the centrifugal force is a non-inertial force. And during the uniform circular motion the tangential force ceases to zero and hence only the centripetal force comes into play to keep an object in uniform circular motion.