Question

what is newton's law ?

Answer 1

Newton's laws of motion are three physical laws that together laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to said forces.
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Answer 2

Newton's laws are the laws which describe the relationship between the force and the body on which force acts.

Newton's first law of motion

According to this law a body at rest will remain in rest and body in motion will remain in motion until an external force is applied.

It is based on inertia. Like inertia of rest inertia of motion and inertia of direction

Newton's second law of motion according to this law the rate of change of momentum of a body is directly proportional to the force applied over it.

F=momentum/ time

Newton's third law of motion according to this law to every action there is a equal and opposite reaction.

Due to eat we can swim walk run etcetera