5 physics lab - Name: - Xiang Wang wangxian2@iit.edu -...

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Name: - Xiang Wang wangxian2@iit.edu - Antonis Antoniou antoant1@iit.edu - Seung Kwon Choi choimik@iit.edu Class: Physics-123 “Mechanics” TA: Ahn Paul Experiment 5 Conservation of Momentum” Date of the Experiment: March, 24 th 2003
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2 1 1 v m v m P BC + = ' 2 1 ) ( v m m P AC + = 2 2 1 1 v m v m P BC + = ' 2 1 ) ( v m m P AC + = Introduction Objective: This experiment contained 2 parts. The objective of Part A was to make up our own experimental procedure to observe and verify the conservation of momentum and energy after the elastic collision of two gliders on a “frictionless” air track. The equations describing these conservations are the following. The objective of part B was to make up our own experimental procedure to study a perfectly inelastic collision of two gliders and determine if momentum is conserved in this kind of collision. Theory: Part A: The equations that describe the relationship between the momentum and energy before and after the collision are: Where m 1 and m 2 are the masses of the two gliders, v 1 and v 2 are the speeds of glider 1 and 2 respectively before the collision and v 3 and v 4 are the speed of the gliders 1 and 2 respectively after the collision. The above equations assume that the surface on which the gliders are moving is frictionless and that there is no wind resistance. The above equation also assumes that the collision between the gliders is perfectly elastic and there is no energy loss during the conversion. Part B: The equations that describe the relationship between the momentum before and after the collision are: Where P BC is the momentum before the collision, P AC is the momentum after the collision, m 1 and m 2 are the masses of the two gliders 1 and 2 respectively, v 1 and v 2 are the speeds of the two gliders respectively before the collision and v is the speed of the connected gliders after the collision. The above equation assumes that the collision is perfectly inelastic. Methods and Materials List of Equipment Used: 2 gliders An air track with an air pump Different weights 2 photogates A computer Procedure: Part A: We set up the air track and put the two photogates about 30 centimeters from each other and connected them to the computer. We equip our gliders with a U shaped gadget that has a rubber band attached to the end of it so that the collision between the gliders will be as elastic as possible. We then launch the 4 2 3 1 2 2 1 1
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5 physics lab - Name: - Xiang Wang wangxian2@iit.edu -...

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