This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
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 ....
View
Full
Document
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.
 Spring '09
 Dr.LotharFrommhold
 Physics, Mass, Momentum

Click to edit the document details