Newton’s First Law:-
A body continues in its state of rest or of uniform motion in a straight line unless an external forces acts on it. It based on Law of Inertia.
Inertia is the Property a body by virtue of which it opposes any change in its state of rest of uniform motion in a straight line.
Inertia of Rest :-
It is the property of a body by virtue of it cannot change its state of rest on its own.
- When a bus or train at rest starts, to move suddenly, the passengers sitting in its jerk in backward direction due their inertia of rest.
- The dust particles come out from a carpet when it is beaten with a stick due to their Inertia of rest.
Inertia of Motion:-
- It is the property of a body by virtue of which it cannot change its state of uniform motion on its own.
- When a running bus or train stops suddenly, passenger sitting in its jerk in forward direction due to Inertia of motion.
Newton’s Second Law:-
The rate of change of momentum of a body is directly proportional to force applied on It and change momentum takes place in the direction of applied force.
F = ma
Where is m is mass of body and is constant.
- If the resultant force on a body is zero the body is said to be in equilibrium.
Newton’s Third Law:-
For every action, there is equal and opposite reaction and both act on two different objects.
- Rocket is propelled by the principal of Newton’s third law of motion.
