Question

(1) : In uniform circular motion the kinetic energy of the body is constant.
(2) : In uniform circular motion the tangential force is zero.

• A. Both 1 and 2 are true and 2 is correct explanation of 1
• B. Both 1 and 2 are true and 2 is not correct explanation of 1
• C. 1 is true and 2 is false
• D. 1 is false and 2 is true

Answer 1

The correct option is A Both 1 and 2 are true and 2 is correct explanation of 1

In uniform circular motion , tangential force is zero. This implies that the angular velocity is constant.
$\therefore v=\omega r$
$\Rightarrow v$ is constant $(\because \omega$ is constant).
$KE=\frac{1}{2}m{v}^2$
$\therefore KE$ constant $(\because$ v is constant.)