Physics II workshop_Part_57

Physics II workshop_Part_57 - of the momenta before and...

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116 2. Car rolls into stationary truck, and bounces off The car has mass m = 2000 kg and velocity v 1 = 5 m s -1 . The truck is initially stationary and has mass M =15000 kg. The car rolls slowly into the truck and bounces off with velocity v 2 . The truck rolls forward with velocity v T ,2 . What are the velocities of the car, v 2 , and truck v T ,2 , immediately after the collision? Can you solve this problem using conservation of momentum alone? If not, what if I tell you that the collision is elastic (kinetic energy is conserved). Can you solve it now? v 1 Before v T, 2 After v 2
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117 Hockey puck – brick collision Conservation of momentum also works in two or more dimensions. But now we equate the vector sums
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Unformatted text preview: of the momenta before and after the collision. Essentially this boils down to resolving the velocity vectors into components and applying conservation of momentum separately to each direction. 1. Strike 1. A hockey puck of mass m = 2 kg slides due East at v 1 = 15 m/s. It bumps into a stationary brick of mass M = 5 kg. Afterwards, the puck slides away to the northeast with velocity v 2 = 8 m/s at = 10 degrees, and the brick slides to the southeast at V 2 at = 11 degrees, What is the final speed of the brick? Is this an elastic collision (does it conserve kinetic energy)? r p sys ( t 1 ) = r p sys ( t 2 ) v 1 m M Before v 2 V 2 After...
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This note was uploaded on 11/26/2011 for the course PHY 2053 taught by Professor Lind during the Fall '09 term at FSU.

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Physics II workshop_Part_57 - of the momenta before and...

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