Question

When does a body rotate? State one way to change the direction of rotation of the body give a suitable example to explain your answer.

Answer 1

Answer:

When the body is pivoted at a point, the force applied on the body at a suitable point rotates the body about the axis passing through the pivoted point. The direction of rotation can be changed by changing the point of application of force.

Answer 2

A body rotates when there is a net torque acting on it. to Change the direction of rotation of a rotating body with fixed axis we will have to provide a retarding torque which will ultimately stop the rotation and will start in the opposite direction. As a result the direction of rotation of the body will change. But if the axis is not fixed then the direction of rotation may be reversed simply by reversing the axis of rotation.