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What is centripetal force?
Asked by hifromthefarms | 28 Dec, 2020, 08:53: PM
When an object moving with speed v in a circular path of raidus R , this object experiences acceleration that is
directed towards centre of the circular path. The object may be moving with uniform speed in circular path ,
but it is keep on changing its direction . This change of direction gives acceleration  in the direction towards
centre of circular path. This acceleration is called centripetal acceleration.

Magnitude of centripetal acceleration is ( v2 / R ) , where v is speed of object in circular path and R is its radius.

According to Newton's second law, the force f providing this acceleration is  f =m ( v2 / R )   ,
where m is the mass of the body. This force directed forwards the centre is called the centripetal force.

For a stone rotated in a circle by a string, the centripetal force is provided by the tension in the string.

The centripetal force for motion of a planet around the sun is the gravitational force on the planet due to the sun.

For a car taking a circular turn on a horizontal road, the centripetal force is the force of friction.
Answered by Thiyagarajan K | 28 Dec, 2020, 10:20: PM

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