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First law -

An object at rest continues to be at rest and an object in motion continues to be in motion till an external force acts on it.

Second law -

The force on an object is directly proportional to the acceleration of the object.

F = ma

Third law -

Every action has an equal and opposite reaction.

Weight = The force acting on a body due to gravity.

Mass = The proportionality constant of the relation force is directly proportional to acceleration.

Gravity = The attractive force exerted by the earth on other objects.