# notes9 - Chapter 9: Impulse, Momentum, and Collisions Up to...

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Chapter 9: Impulse, Momentum, and Collisions Up to now we have considered forces which have a constant value (does not depend on time) throughout the motion and no explicit time duration Now, lets consider a force which has a time duration (usually short) and with a magnitude that may vary with time – examples: a bat hitting a baseball, a car crash, a asteroid or comet striking the Earth, etc. It is difficult to deal with a time-varying force, so we might take the mean value F t t i t f Δ t F avg

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Define a new quantity by multiplying the force by the time duration - a vector, points in the same direction as the force - has units of N s Define another quantity, but which gives a measure of the motion - a vector, points in same direction as the velocity - units of kg m/s = N s F avg Δ t = I = Impulse momentum linear v = = p m
Example A car of mass 760 kg is traveling east at a speed of 10.0 m/s. The car hits a wall and rebounds (moving west) with a speed of 0.100 m/s.

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## This note was uploaded on 12/10/2011 for the course PHY 1111 taught by Professor Stencil during the Fall '11 term at University of Georgia Athens.

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notes9 - Chapter 9: Impulse, Momentum, and Collisions Up to...

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