lec22b - Lecture 22 P112 Mar 10, 2008 announcements Prelim...

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Lecture 22 P112 Mar 10, 2008
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announcements Prelim 2: April 3, 7.30pm
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Agenda for today Inelastic and elastic collisions
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When can you use conservation of Momentum 1. No net external Forces 2. Time interval is short: § Impulse from external forces is negligable Ex: Ball hitting bat Neglect gravity during collision
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collisions Momentum is conserved if Σ F ext = 0 Elastic Collision: the forces are conservative- Both kinetic energy and momentum is conserved Example: colliding steel balls Inelastic collisions: kinetic energy after the collision is less than before Example: objects that stick together, are permanently deformed,…
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Elastic vs. Inelastic Collisions A collision is said to be elastic when kinetic energy as well as momentum is conserved before and after the collision. K before = K after Carts colliding with a spring in between, billiard balls, etc. v
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lec22b - Lecture 22 P112 Mar 10, 2008 announcements Prelim...

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