# I Is an individual vehicle’s linear momentum p = m v ...

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1 Physics 211: Lab Instructions Crash Lab (Impulse, Momentum & Energy) Reading Knight: Chapter 11, Sections 1-4; Conceptual Understanding Goals: By the end of this laboratory, you should be able to: (1) Determine the impulse exerted on an object from its mass and change in velocity. (2) Determine the average force on an object during a collision given its impulse and the duration of the collision. (3) Determine whether momentum is conserved in a collision. (4) Determine whether kinetic energy is conserved in a collision. (5) Articulate the conditions for momentum and/or energy to be conserved in a collision. Laboratory Skill Goals: By the end of this laboratory, you should be able to: Draw reasonable conclusions about momentum and kinetic energy conservation based upon experimental data. Demo Equipment List: Computer with Capstone™ and Pasco® 550 Universal Interface Ultrasonic Motion Detector Dynamics collision cart Extra mass (500 g) 2-meter long low-friction track (shared between two adjacent groups) Grading rubric: 100% 90% 80% 0% Lab handed in completed by Friday night. Participation in Discussion board (post and reply) completed by Wednesday night. Physics is largely correct. Lab handed in completed by Friday night. No Discussion board post or reply. Contains one or two physics errors, or some small math errors. Lab handed in completed by Friday night. No Discussion board post. Contains large physics errors or is incomplete. Lab not handed in Physics 211R: Lab – Crash Lab
2 Enter your name as it appears in your PSU registration, no nicknames please. Name: Mahek Shah Section # 35 When you get to the “check with a TA” it is a recommended (not required) time to post on your group discussion board. Post a question, double check an answer, help out someone else with the same problem. It is strongly recommended you log into zoom to “check with TA” at anytime, or to work on this together as a group. TA’s and the group-chat room are available 8AM-8PM on Zoom Monday-Thursday and 3-5 Friday to help if you get stuck or need a nudge. Lab Goal: In this lab you have been charged with answering 3 of these these specific questions about collisions between 2 cars from actual crash data you are given: I. Is an individual vehicle’s linear momentum ( p = m v ) conserved during a collision? II. Is the total linear momentum ( P = p 1 + p 2 ) of the system of two vehicles conserved during a collision? III. Is the total mechanical energy ( E = K + U ) of the system of two vehicles conserved during a collision? (Is it the same before & after the collision?) What about just K? IV. Does the type of collision – that is, whether the vehicles bounce off one another or whether the vehicles stick together – affect what happens to the momentum and the mechanical energy? V. In a collision between a stationary vehicle and a moving vehicle, which vehicle experiences the larger change in momentum? VI. In a collision between a more massive vehicle and a less massive vehicle, which vehicle experiences the larger change in momentum? Q0.1 Warm-up: