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2015-09-30T15:43:20+05:30

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1. The law which gives concept or definition of force is Newton's second law.
2. The law which gives expression of force is also Newton's second law.

Newton's second law: 
The net force acting on a body is directly proportional to its rate of change of momentum.

Mathematically, second law can be expressed as: F = ma
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2015-09-30T17:06:31+05:30
Newton's Second Law Of Motion:The rate of change of change of momentum is directly proportional to the force applied and it takes place in the direction of force.
Mathematical Expression : F=ma (where f= force,m= mass and a= acceleration).
                i hope that this will help u.
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