# Mom (8) - Momentum and Collisions We look at another...

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10/03/2006 1 Momentum and Collisions We look at another consequence of Newton’s Laws of Motion. This time the emphasis is on Newton’s Third Law. 10/03/2006 2 Newton II rewritten: Acceleration is the rate of change of … Velocity. We call mass times velocity momentum Momentum is a vector. The unit is kg m/s F = ma = m Δ v Δ t = mv f mv i Δ t = p f p i Δ t F = Δ p Δ t p mv 10/03/2006 3 Impulse Multiply both sides by Δ t. Force times time equals impulse. Unit is N s Impulse-momentum theorem: 1 N s = 1 kg m/s F = Δ p Δ t F Δ t = Δ p J = F Δ t 10/03/2006 4 Non-constant forces Can we use the impulse-momentum theorem if the forces are not constant? Yep! The area under the force vs. time curve is impulse. What average force will give the same impulse (area) for the same time? Example: Think about landing from a jump. What makes it easier?

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10/03/2006 Problem #1 A boy kicks a football with an average force of 90.0 N for a time of 0.200 s.
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## This note was uploaded on 05/06/2011 for the course PHYS 103N taught by Professor Chiu during the Spring '11 term at University of Texas.

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Mom (8) - Momentum and Collisions We look at another...

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