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Newton’s law of universal gravitation is used to extend the study of uniform circular motion to the centripetal acceleration caused by the gravitational force on satellite These ideas are applied to weather forecasting and communication satellites.

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Vehicle speeding down a mountain road at dusk

Angular motion: 		The motion in which a body moves along a circular path about a fixed point or axis. For example A car moving around a corner The motion of fans Motion of moon around Earth

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Angular displacement : 		 Angular displacement is the angle in radian, degree and revolutions through which a body revolves around a center or a specific axis.

SI unit of angular displacement is radian.

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Linear Quantity Angular Quantity Relationship Displacement  S Velocity   v Acceleration  a Force   F Torque   T         T = r F Momentum  p Angular momentum  L          L = r p Mass  m Inertia  I

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Centrifugal force or Reaction force: 		When we whirl a ball at the end of a string, we transmit this force to the ball by means of string pulling it inward and thus keeping it in circular path. 	According to Newton 3 rd  law the ball will react and will exert an equal force outward on the hand. This outward force on our hand is known as centrifugal force. If the string breaks then centripetal force suddenly removed.

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Banking of road: 		If  car is travelling round a circular path with uniform speed on horizontal road, the resultant force acting directed towards center of circular path is centripetal force. 	The centrifugal force arises from the interaction of car with air and the ground. The resultant of these two forces is the centripetal force.

Rotational And Circular motion

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