lecture16_post

# lecture16_post - Announcements Exam 1 You will get back...

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Exam 1: You will get back your exam next Tuesday, after which you can double check that the grading is correct. You will not get back your scantron. If the answers on your scantron and your exam are different, only the one on the scantron will count. Announcements

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Recap: conservation of Momentum • In a collision, the momentum of each object will change. • The total momentum of the system remains constant Momentum conservation
m 1 v 1i + m 2 v 2i = (m 1 +m 2 )v f Elastic collision: kinetic energy conservation (1/2)m 1 v 1i 2 + (1/2)m 2 v 2i 2 = (1/2)m 1 v 1f 2 + (1/2)m 2 v 2f 2 Perfectly inelastic collisions (m 1 and m 2 stick together): ) v v ( v v f 2 f 1 i 2 i 1 = For 1D “head-on” collisions: equivalent

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1.2 m 1.2 m v T v B 1.2 m v T v B '
airplanes need Air

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Rocket Propulsion • The operation of a rocket depends on the law of conservation of momentum as applied to a system, where the system is the rocket plus its ejected fuel • different than propulsion on the earth where two objects exert forces on each other • Road on car • Train on track

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lecture16_post - Announcements Exam 1 You will get back...

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