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Unformatted text preview: Chapters 20 Accounting for Linear Momentum Total Momentum is Conserved • Total linear momentum (LM) is conserved. • Total angular momentum (LM) is conserved. • There is no generation or consumption of total linear or angular momentum. In – Out = Acc Linear Momentum • Linear momentum , • Linear momentum and velocity are vector quantities (Cartesian, spherical, cylindrical). – Need to resolve different directions • Mass is a scalar quantity. velocity linear : v mass : m v m p = p Amounts and Rates • The Conservation Eqn can be applied using amounts or rates of a material. Momentum [LMt1 ], units: kg . m/s, lb m . ft/hr Rate of momentum [MLt2 ], units: N, lb f Amt: Rate: acc out in ψ ψ ψ = dt ψ d ψ ψ ψ acc out in = = p ψ p ψ Parts of LM Conservation Eqn • LM can enter or leave a system with the flow of materials. • LM can enter or leave a system as a result of external forces....
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This note was uploaded on 03/11/2010 for the course ENGI 150 taught by Professor Annsaterbak during the Fall '08 term at Rice.
 Fall '08
 ANNSATERBAK

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