Class 11th

Work, Energy and Power

Work:

o    Work is said to be done when the force applied on an object make some change in the state of object.

o    Work is the scalar product of force and displacement produced in the object.

1.1   Work done by a constant force

            Consider an object undergoes a displacement S along a straight line while acted on a force F that makes an angle q with S as shown.


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ROTATIONAL MOTION

Rigid Body     

A body is said to be rigid if the distance between any two particles of the body remains invariant under the action of any force.

The plane motion of a rigid body is represented as the combination of translational motion and  rotational motion.

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GRAVITATION
NEWTON’S LAW OF GRAVITATION

            The magnitudes and the direction of the gravitational force between two particles are given by the universal law of gravitation, which was formulated by Newton.

Universal law of gravitation:

            The gravitational force of attraction between two particles is directly proportional to the product of the masses of the particles and is inversely proportional to the square of the distance between the particles. The direction of the force is along the line joining the two particles.
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