Friday, July 06, 2007

Newton's Laws of Motion

Newton's laws of motion are three physical laws. These laws provide relationships between the forces acting on a body and the motion of the body.Newton's laws were first published together in his work Philosophiae Naturalis Principia Mathematica (1687). The laws form the basis for classical mechanics. Newton used them to explain many results concerning the motion of physical objects.

Newton's First Law of Motion:
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.

Newton's Second Law of Motion:
The relationship between an object's mass m, its acceleration a, and the applied force F is F = ma. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector.

Newton's Third Law of Motion:
For every action there is an equal and opposite reaction.

The first law is termed as the "Law of Inertia".  The second law aid in quantitative calculations of dynamics.  This law explains the velocity chnages that happen when a force is applied.  The third law exemplifies by what happens when we bounce a rubber ball on the ground it pushes back itself witht he same force in the opposite direction.

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