View source for Newton's Laws of Motion

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'''Newton Laws of Motion''' are a set of three fundamental postulates forming the basis of the mechanics 
of rigid bodies, formulated by Newton in 1687.

 
'''The first law''' is concerned with the principle of inertia and states 
that if a body in motion is not acted upon by an external force, its momentum 
remains constant (law of conservation of momentum). 

'''The second law''' asserts that the rate of change of momentum of a body and is in the direction of the 
applied force. A familiar statement of this is the equation '''''F = ma''''' where '''''F''''' is 
vector sum of the applied forces, '''''m''''' is the mass, and '''''a''''' is the vector 
acceleration of the body. 

'''The third law''' is the principle of action and 
reaction, stating that for every force acting upon a body there exists a 
corresponding force of the same magnitude exerted by the body in the opposite 
direction. 

==References==
''This article is based on NASA's [[NASA SP-7|Dictionary of Technical Terms for Aerospace Use]]''

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