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Drexel University *

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170

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Mechanical Engineering

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Jan 9, 2024

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Lab03: Simulation and Energy Student #1: Aryan Dixit Student #2: Instructions: Read and print out this document prior to attending the lab. Follow along with the instructions and answer the questions using complete sentences. Hand in one document per lab group at the end of the lab period. Note: you must be present to gain credit for the lab. A) Using Chrome, go to this website, click on “Intro”, and check ‘on’ all of the boxes in the top right corner. https://phet.colorado.edu/sims/html/energy-skate-park-basics/latest/energy-skate-park-b asics_en.html 1. Drag the skateboarder to different heights on the parabolic ramp to run the simulation. Investigate how the potential and kinetic energies of the skater change as the skater moves from the top of the ramp to the bottom. Fill in the blanks based on your observations: As the skateboard rolls down the ramp it loses potential energy and kinetic energy. The total energy of the skateboarder remains constant . 2. Drag your skater to the 6 m height on the parabolic ramp and run the simulation. Explore how the potential and kinetic energies change as the height of the skateboarder changes. Pause the simulation at different heights and fill in the table based on your observations. Height of skater (m) Which is greater? (circle your answer) 2M Kinetic Energy Potential Energy 4M Kinetic Energy Potential Energy 6M Kinetic Energy Potential Energy 0M Kinetic Energy Potential Energy 3. What conclusions can you make about how the height of the skater influences the potential energy of the skater? Lab03: Simulation and Energy PHYS 171: Computational Lab for Electricity and Motion C. Love, Drexel University; edited by R. Kratzer, Drexel University Page 1 of 6
The higher the skater is on the ramp, the greater their potential energy. As the skater descends, their potential energy decreases and kinetic energy increases. So, height and potential energy are directly related: higher height equals more potential energy, and lower height equals less potential energy. 4. Explore how the skater’s speed relates to her potential and kinetic energies. Pause the simulation at the given speeds and fill in the table based on your observations. SPEED 1= KINETIC IS GREATEST. POTENTIAL IS LOWEST SPEED 2= POTENTIAL IS GREATEST. KINETIC IS LOWEST SPEED 3= POTENTIAL IS GREATEST. KINETIC IS LOWEST 5. What relationships exist between the speed of the skater and the skater’s potential and kinetic energies? The speed of the skater and their potential and kinetic energies are interconnected. As the skater gains speed (moves faster), their kinetic energy increases. Conversely, as the skater loses speed (slows down), their kinetic energy decreases. The skater's potential Lab03: Simulation and Energy PHYS 171: Computational Lab for Electricity and Motion C. Love, Drexel University; edited by R. Kratzer, Drexel University Page 2 of 6
energy, on the other hand, decreases as they move lower and increases as they move higher on the ramp. So, when the skater gains speed, their kinetic energy goes up, and when they change height, their potential energy changes accordingly. 6. Using the parabolic track, adjust the simulation a few different ways so that the total energy bar changes. Use the table below to record your observations. What did you do? The total energy…. (circle your answer) Changing the total mass to small Increases Decreases Changing the total mass to large Increases Decreases Start point at 6m Increases Decreases Start point at 0m Increases Decreases B) A skater begins at a height of 5 m and rolls along the variable track (see diagram) with friction. You can choose the friction simulation at the bottom of the screen and the variable track on the right of the screen. Two students make claims about the changes in the skater’s energy and motion. Student A: As the skater moves along the track, some of her kinetic energy is converted to thermal energy. She will lose energy causing the total energy of the system to decrease. Because the total energy of the system decreases, the skater will not be able to use as much energy to get up the track and will not get back up to her original starting Lab03: Simulation and Energy PHYS 171: Computational Lab for Electricity and Motion C. Love, Drexel University; edited by R. Kratzer, Drexel University Page 3 of 6
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