Question

The angular acceleration of a particle moving along a circular path with uniform speed is:

• A. zero
• B. variable
• C. uniform but non-zero
• D. incomplete information

Answer 1

Answer: (A)

zero

Angular acceleration $\alpha =\frac{\Delta \omega }{\Delta t}$ and $\omega =\frac{v}{r}$
since the particle is moving with uniform speed, so its angular velocity will also remain same i.e. $\Delta \omega =0\Rightarrow \alpha =0$