Lec7 - General Physics IMPULSE AND MOMENTUM Linear Momentum...

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General Physics Dr. Brahmia 1 IMPULSE AND MOMENTUM Linear Momentum Linear momentum ( p ) is defined as the product of an object’s mass ( m ) and its velocity ( v ). Momentum is a vector quantity and the direction of momentum vector is the same as the velocity vector. The unit of linear momentum is kg.m/s. v m p t p F avr Newton’s second law may be written in terms of the average force required to change an object’s momentum ( p ) in a time interval ( t ) as follows: IMPULSE AND MOMENTUM... Impulse An impulse is defined as the product of force ( F ) acting on an object and the time ( t ) during which the force acts. The unit of impulse is ( N.s ), where 1 N.s =1 kg.m/s An impulse causes a change in an object’s momentum. t F I i f v m v m p t F
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General Physics Dr. Brahmia 2 IMPULSE AND MOMENTUM... Conservation of Linear Momentum In any collision between two or more objects, if the NET external force is zero , the vector sum of the momenta of the system before impact equals the vector sum of the momenta after impact.
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