# Ch-6 - Chapter 6 Momentum and Collisions Momentum The...

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Chapter 6 Momentum and Collisions
Momentum The linear momentum of an object of mass m moving with a velocity is defined as the product of the mass and the velocity SI Units are kg m / s Vector quantity, the direction of the momentum is the same as the velocity’s Applies to two-dimensional motion m = p v r r y y x x mv p and mv p = =

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Impulse In order to change the momentum of an object, a force must be applied The time rate of change of momentum of an object is equal to the net force acting on it Gives an alternative statement of Newton’s second law When a single, constant force acts on the object, there is an impulse delivered to the object is defined as the impulse Vector quantity, the direction is the same as the direction of the force ( ) f i net m v v t t - = = p F r r t = I F r r I r
Impulse-Momentum Theorem The theorem states that the impulse acting on the object is equal to the change in momentum of the object If the force is not constant, use the average force applied f i t m m = ∆ = - F p v v r r r r av t = ∆ F p r r

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Conservation of Momentum The principle of conservation of momentum states that when no external forces act on a system consisting of two objects that collide with each other, the
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