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Centripetal and Centrifugal Force

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Difference between cetrifugal and centripetal force - definition

Centripetal Force
Centrifugal Force
A centripetal force is a force that makes a body follow a curved path. Its direction is always orthogonal to the motion of the body and towards the fixed point of the instantaneous center of curvature of the path.Centrifugal force is an outward force apparent in a rotating reference frame; it does not exist when
measurements are made in an inertial frame of reference. All measurements of position and velocity must be made relative to some frame of reference.
Centripetal Force is observed from inertial frame of reference.
Centrifugal Force is observed from non- inertial frame of reference.


Define Centripetal Force - definition

Definition:
Centripetal force
is a force acting on particle performing the circular motion, which is a long radius of circle and directed towards the center of circle.

Centripetal force acts at right angles to the tangential velocity of the particle, there is no displacement in the direction of force, hence no work is done by centripetal force.

Examples of Centripetal Force - example

Examples of Centripetal Force:
1. When an object tied at the end of a string is whirled in a horizontal circle, the necessary centripetal force for maintaining circular motion is provided by tension in the string.
2. If a car is traveling round a circular horizontal road with uniform speed, the necessary centripetal force for negotiating the curve is provided by force of friction between tyres of vehicle and road surface.
3. The necessary centripetal force is  provided by push due to rails on the wheels of train during taking turn.
4. Moon revolves around the earth in circular orbit. Here the necessary centripetal force is provided by gravitational force of attraction between moon and earth.

Define Centrifugal Force - definition

Definition:
Centrifugal force
is a pseudo force in U.C.M. which acts along radius and directed away from the centre of circle.

Examples of Centrifugal Force - example

Examples of Centrifugal force:

1. When a car in motion takes a sudden turn towards left, passengers in a car experiences an outward push to the right. this is due to the centrifugal force acting on passengers.
2. A bucket full of water is rotated in  vertical circle at a particular speed, so that water dose not fall. This is because, weight of water is balanced by centrifugal force acting on it.
3. The bulging of earth at equator and flattering at the pole is due to  centrifugal force acting on it.

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Define centripetal force. Write the expression for it.

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Statement-2: They are always equal and opposite.

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State whether true or false. 
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Centripetal and centrifugal forces cancel each other.

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