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Unformatted text preview: Work and Energy Simulation Name_______________________ Lab Worksheet Group member names__________________________________ This sheet is the lab document your TA will use to score your lab. It is to be turned in at the end of lab. To receive full credit you must use complete sentences and explain your reasoning clearly. Be sure to read Chapter 11 (Work) in Knight before attempting this lab. Go to the link, http://phet.colorado.edu , in a browser and click on the Go to the simulations button. Open Work, Energy, and Power on the left. This lab uses three of the simulations on this page, Masses and Springs , Energy Skate Park , and The Ramp . I. Masses and Springs: After opening the simulation Masses and Springs spend some time playing to become familiar with the various options and settings before attempting to answer the questions below. Please do take the time to let everyone spend at least five minutes at the computer at this stage. When you all know how to run the simulation you will be directed to the particular settings for each part below. Settings for this part are shown below. Note that g is set to zero, time is slowed to 1/8 time, and the friction is turned to 0 for now. With g = 0 this simulation behaves exactly like a horizontal mass-spring system with gravity turned on. Friction is then interpreted as between the mass and the surface on which it slides. Work and Energy Simulation Name_______________________ Lab Worksheet 2 1) Pull the mass down and hold it in place. You are doing Work on the system as you stretch the spring. a) What happens to the Mechanical Energy, E , of the system as you stretch the spring away from equilibrium? (increase, decrease, or stay the same) Mechanical energy, E , is defined as K + U . b) What happens to the Mechanical Energy of the system as you compress the spring away from equilibrium? (increase, decrease, or stay the same) This happens when you push the mass toward the top of the screen....
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