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2014-09-16T23:49:13+05:30
Centripetal force is aforce thatacts inwards on a body that rotates or mooves alonga curved path and is directed towards the centre of curvature of the path or axis  of rotation eg.movement of a vehicle along a curved path. centrifugal force is acting outwards.eg when we grind things using a mixer ,things will move to the sides
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THE FROCE THAT ACTING TOWARDS THE CENTRE IS CALLED CENTRIPETAL FORCE
2014-09-17T13:49:47+05:30

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Frame of reference is the coordinate axes (x and y)

Suppose there are no external forces acting on a particle in motion. Due to inertia of motion the particle always moves in a straight line and at uniform speed and uniform velocity.

If a body has to move in a circular arc, there has to be an external force acting perpendicular to this straight line to turn the particle in an arc. This external force has to supply acceleration perpendicular to particle's velocity.  So path of the particle deviates from initial path. After a little time, again the body continues to go in a straight line along the bent path. So in order to make it move in a circular arc, the external force acts on it perpendicular to its velocity and bends the particle in a circular path.

At each point on the path of the particle, an external force is needed to make the particle continue in the circular path. Such a force is called centripetal force.

For earth moving in a circular path around the Sun, the gravitational force of attraction acts on the Earth at each point on the circle. It is in the direction of radius towards the Sun. This is the centripetal force.

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Centrifugal force is not a real force. it is a fictitious or imaginary force. It is used to solve our problems in an easier way. When a particle is moving with an centripetal acceleration and there are multiple forces acting on it, we use the concept of centripetal force.

Normally we use the frame of reference which is stationary or moving with a uniform velocity. Then Newton's laws apply.  Suppose we attach ourselves to a frame of reference which is moving with an acceleration, then Newtons laws will not be valid. To be able use Newtons' laws, we add a fictitious force to each object in the opposite direction to that of acceleration of frame of reference. That force is equal to mass of particles and that acceleration.

As the earth is rotating about itself, we are moving around in a circle. The frame of reference is moving with an acceleration in reality. So for each object we attach a centrifugal force acting along radius and away from the center of earth. There is gravitational force (weight) acting towards the center.  So they cancel and we remain stationary in the frame of reference of earth.

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