Which force does balance centripetal force?

For example if we are rotating a ball tied with a string then centripetal force is acting inwards. Then which force balances it. I thought it is the centrifugal force but it is a pseudo force.

  • $\begingroup$ More on centripetal vs. centrifugal. $\endgroup$
    – Qmechanic
    Dec 16, 2015 at 14:14
  • 1
    $\begingroup$ See also this physics.stackexchange.com/q/93599/37364 $\endgroup$
    – mmesser314
    Dec 16, 2015 at 15:02
  • $\begingroup$ Why do you think there must be a force that "balances" the centripetal force? I guess you are thinking of Newton's third law of motion (For every action there is an equal and opposite reaction), but this "reaction" is not always a balancing force. In the case of the centripetal force on the Moon that makes it circle (approximately) the Earth, the "reaction" is the force the Moon exerts on the Earth, but it's not balancing the centripetal force on the Moon. You could say it does "balance the books" regarding momentum, only meaning that the law of conservation of momentum is not broken. $\endgroup$ Nov 23, 2021 at 13:56

2 Answers 2


There is no force that balances the centripetal force, and because of this, you get acceleration inward and circular motion. If the force were balanced, you would get no acceleration, and no circular motion.


Well i guess that at the point which the rope is held or tied ; to keep that thing stationery the rope exerts force on the hand(screw/ axle) OPPOSITE to the force that is exerted on rock(bob) by it.

hand -T----->-----------------------------<------O (bob)


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