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Conservation of Energy

A series of free High School Physics Video Lessons from Brightstorm online Physics series..

Momentum
Momentum is a vector quantity used to quantify an object's motion in which the direction of the vector is the same as the direction of the object and the magnitude is equal to the mass times the velocity. According to the law of conservation of momentum, in collisions between multiple objects, the total momentum of the system remains unchanged. The formula for momentum is momentum = mass x velocity.

Impulse
Impulse measures the change in the momentum of an object. Impulse is expressed as the integral of force over time and its unit is the Newton-second (N x s). Expressed without Calculus, impulse = force x time.

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