Is centripetal force present in rotating objects? I just solved a question in which an uniform rod rotates about a vertical axis with its one end pivoted. The angular acceleration is found by just equating the torque due to mass of the rod with I alpha. Why is centripetal force and torque due to it not considered when every circular motion has centripetal acceleration. If i have wrongly understood some concept pls correct me.

  • $\begingroup$ What is a vertical point? $\endgroup$
    – Alchimista
    Jan 15, 2019 at 11:38
  • $\begingroup$ I meant vertical axis.. Sorry it was a typo $\endgroup$
    – Ruqa
    Jan 15, 2019 at 18:25

1 Answer 1


The centripetal force does act on every particle in the rotating rod.

However the centripetal force is directed towards the centre from that point.

Therefore the torque caused by it would be $0$ as torque is $rF \sin \theta$ and for this $\theta = 0$


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