# A particle moving uniformly in a circle is in rotational equilibrium . is it true or false ?

Q: A particle moving uniformly in a circle is in rotational equilibrium . is it true or false ?

Sol: It is true . A particle is said to be in rotational equilibrium when its angular acceleration is zero . Since the particle moves uniformly , its angular velocity is constant in magnitude and direction and so its angular acceleration is zero . So it is true that a particle in uniform circular motion is in rotational equilibrium .