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1208_chap19

# 1208_chap19 - ME240 Agenda 19.2ImpulseandMomentum...

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d ME 240 Agenda: 19.2 Impulse and Momentum 19.3 Impacts Ch. 19 Problems – due Monday HW: 19.67, 19.80 Supplemental: 19.64, 19.86

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Impacts – Coefficient of Restitution To solve planar rigid body impact problems: Use linear/angular impulse and momentum equations se restitution equations (applied to contact point velocities) Prior to impact: After impact: Use restitution equations (applied to contact point velocities) ) ( ) v  Restitution equation () BP n AP n AP n BP n vv e Normal velocities at impact point P No friction–tangential forces are zero 8 38    PG nn r  where
Impacts–Unconstrained Rigid Bodies rior to impact: fter impact: Prior to impact: After impact: Conservation of system linear momentum: 11 22 nn AA BB mv   normal direction: 12 t t vv  tangential direction (no friction ): 8 39 tt

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Impacts–Unconstrained Rigid Bodies Prior to impact: After impact: B A B A
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1208_chap19 - ME240 Agenda 19.2ImpulseandMomentum...

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