Question

State Newton's all three laws of motion. Give one example of each.

Answer 1

Newton has given three laws to describe the motion of bodies. These laws are known as Newton's laws of motion.

1) NEWTON'S FIRST LAW OF MOTION :-
A body at rest will remain at rest, and a body in motion will continue in motion in a straight line with the uniform speed, unless it is compelled by an external force to change its state of rest or of uniform motion.
Newton's first law a recognizes that every body have some inertia.
Inertia is that property of body due to which it resists a change in its state of rest or of uniform motion.

Answer 2

Newton gave three laws of motion to describe state of any body which is in motion or rest.

Explanation:

Newton's First Law of motion:

"Any body in uniform motion will continue moving with constant speed and any body at rest will remain at rest unless and until an external force of push or pull is applied on that body".

• It introduces the concept of inertia.
• Inertia is the the tendency of any body to resist any change in its motion.
• Example: Feeling a force when brakes are applied in any vehicle is an example of first law of motion. The body resists change in its motion when brake is and that is why force is felt.

Newton's second law of motion:

"Force is defined as the rate of change in momentum of a body with time".

• This law talks about momentum of a body which is mass times its velocity.
• This law gives an expression for force, which is $F=ma$ which states that force is mass times the acceleration with which the body is moving.
• Example: When pushing a car and a truck with same force, the acceleration of car is more because its mass is less as compared to truck.

Newton's third law of motion:

"Any force of action will have a reaction which is equal in magnitude and opposite in direction to the action force".

• It states that force always comes in action-reaction pair.
• Example: A body kept of a table will not fall down because the table exerts the same amount of force on the body as it exerts on the table due to gravity, which is its weight.