Mechanics deals with the study of general system of particles, rigid bodies, deformable bodies, liquids, propulsion of rockets, propagation of water waves, sound waves etc.

In our daily life, we observe the walking men, the moving bicycles, the running trains, the crawling insects, the water flowing down a dam, the flying aeroplanes etc. In all the above examples, the object is in motion. In fact, motion is the change in position of an object.

*The branch of Physics which deals with the study of motion of material objects is called Mechanics.*

Mechanics can be broadly classified into following branches :-

**(1) Statics.** It is a branch of mechanics which deals with the study of material objects at rest.

An object can be at rest, even when a number of forces acting on it are in equilibrium. Thus, statics is

the branch of mechanics which deals with the study of motion of objects under the effect of forces in

equilibrium.

Here, time factor does not play any role.

**(ii) Kinematics. **It is that branch of mechanics which deals with the study of motion of material objects without taking into account the factors (i.e., nature of forces, nature of bodies etc.) which cause motion.

Here, time factor plays an essential role. The term Kinematics is derived from a Greek word ‘Kinema’

meaning motion.

**(iii) Dynamics. **It is that branch of mechanics which deals with the study of motion of objects taking into account the factors which cause motion.

Here, time factor plays an essential role. The term dynamics is derived from the Greek word ‘Dynamis’ meaning power. Since the force is the cause of motion, therefore dynamics is based on the concept of force.

Newton has contributed towards the measurement of force from his three famous laws of motion

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