Question

laws of motion and definition of inertia ? IN SHORT

Answer 1

1st law of motion
property of a body to continue its state of rest or uniform motion unless acted upon by  net force.
2nd lw of motion
The rate of change of momentum of body which is directly proportional to the force applied to it.
3rd law of motion
Every action has an equal and opposite reaction.
INERTIA
The inability of a body to change its state unless  force acts on it.

Answer 2

1) First Law of Motion: A body remains in its state of rest or state of motion until and unless any external force is applied on it. This is also called Newton's first law or law of inertia.

#Inertia- It is the property of objects that remain to continue in the state or rest or motion till no external force acts on them.
OR
When no force is exerted on an object it stays at rest or it moves in a straight line with constant speed.
Inertia is of three types:- Inertia of Rest, Inertia of Motion and Inertia of Direction.

2) Newton's Second Law of Motion: According to Newton's second law of motion force applied on a body is directly proportional to the rate of change of momentum.

3) Newton's Third Law of Motion: It states that every action has an equal and opposite reaction.