Rev. Notes > IGCSE > Forces Previous Topic Forces Next Topic Topics
 Force Effect of force Friction Balanced forces Unbalanced forces Addition of forces Newton's firts law of motion Newton's second law of motion Newton's third law of motion Circular motion Circular motion - Examples Center of mass Hook's law Hook's law (Elastic behaviors) Hook's law (Plastic behaviors) Hook's law - Elastic limit Effects of applied force on the materials Moment of force Priciple of moment of force Equilibrium Conditions of equilibrium

## Circular motion

Moving in a circle means that the direction of motion is changing constantly.

So, if an object is moving in a circle, it follows that there must be a force acting on it to change its direction.

Therefore we can say that the direction of force is constantly changing.

In order to move an object on a circular path,the force must always be acting towards the centre of the circle.

This force which is always towards the centre of the circle is given the name of centripetal force.

This centripetal force acts perpendicularly to the direction of motion of the object at any instant.

It can be calculated by the following formula

Fc=mv2/r
F= Centripetal force is N
M = mass of object in kg
V = Speed of object in m/s

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