g7 - Definition of Momentum • The momentum of a particle...

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Unformatted text preview: Definition of Momentum • The momentum of a particle is defined as vector p = m vector v • Momentum is a vector • Newton’s 2nd law ∑ vector F = m Δ vector v / Δ t may be rewritten summationdisplay vector F = Δ vector p Δ t provided mass does not change with time. • Actually, this is the correct form of the 2nd law c circlecopyrt L.Frommhold . – p.18/18 Conservation of Momentum • Two particles collide; only impulse force present Δ vector p A = m A vector v ′ A- m A vector v A = vector F A Δ t Δ vector p B = m B vector v ′ B- m B vector v B = vector F B Δ t =- vector F A Δ t • Add these two equation to get m A vector v ′ A + m B vector v ′ B = m A vector v A + m B vector v B or vector p A + vector p B = vector p ′ A + vector p ′ B • Conservation of momentum c circlecopyrt L.Frommhold . – p.17/18 About Rockets • When the rocket fires, gas is expelled at high speeds out of the rear. The rocket accelerates, vector p rocket = vector p ′ rocket + vector p ′ gas Note that vector p ′ rocket and vector p ′ gas are in opposite directions, so that p ′ rocket > p rocket ....
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This note was uploaded on 10/21/2009 for the course PHYSICS 30 taught by Professor Dr.lotharfrommhold during the Spring '09 term at University of Texas.

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g7 - Definition of Momentum • The momentum of a particle...

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