2007_Fall_P112_Lab_05_Prelab - Lab Section Name Lab...

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Lab Section: ______ Name: ______________________________ Lab Instructor: ______________________________ Lab Unit # 5 Pre-lab Questions: Collisions I – “Bounce” Collisions 1. (a) In a head-on (1-D) elastic collision between two identical pucks on a frictionless surface, where puck # 1 (“projectile”) is initially moving in the x + direction at speed v towards puck # 2 at rest (“target”), what should be the velocities v and v of the pucks after colliding? 0 x f 1 x f 2 = x f 1 v ____________________. = x f 2 v ____________________. Please include diagrams showing Before and After the collision: Before: After: (b) What should be the velocities of the center of mass (CM) of the two pucks before (i) and after (f) the collision (in terms of v )? 0 = x CMi v ____________________. = x CMf v ____________________. Please show any calculations that you use: (c) Do your answers to part (b) depend on whether or not the collision is elastic ? Please explain briefly. (HINT: Be sure you know what elastic means for collisions.) (Continued on the next page.) P112 Lab Notes Pre-lab 5-1 Cornell University, Fall 2007
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P112 Lab Notes Pre-lab 5-2 Cornell University, Fall 2007 2. Now consider the 2-D collision between two identical
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