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Simply stated: Newton's First Law of Inertia: An object will remain in uniform motion in a straight line, unless acted upon by an unbalanced force, or an object in motion will remain in motion in a straight line unless acted upon by an unbalanced force.  

Second law: The acceleration a of a body is parallel and directly proportional to the net force F acting on the body, is in the direction of the net force, and is inversely proportional to the mass m of the body, i.e., F = ma
The acceleration of an object depends on the mass and the force acting upon it.
Formula: F= ma
F= force m= mass a= acceleration
 

Third law: When a first body exerts a force F_{1} on a second body, the second body simultaneously exerts a force F_{2} = −F_{1} on the first body. This means that F_{1} and F_{2} are equal in magnitude and opposite in direction.
Newton's Third Law Of Motion: For every action there is an equal and opposite reaction. 