LAB6_ConservationofEnergy

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Southwest Tennessee Community College *

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200

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Physics

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Apr 3, 2024

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pdf

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5

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College Physics -1 (PHY200L) Baptist Health Science University Lab 6: Conservation of Energy http://phet.colorado.edu/en/simulation/energy-skate-park-basics Objective : To investigate the relationships among kinetic, potential, thermal, and total energy and how friction affects these energies. Accessing the website: Through a web browser (Firefox, Internet Explorer or safari), navigate to http://phet.colorado.edu . Click "Play with Sims," then "Physics," then "Work, Energy, and Power," then choose the "Energy Skate Parks: Basics" simulation. Click "Run now" to start the simulation or enter the link: http://phet.colorado.edu/en/simulation/energy-skate-park-basics This is a screen shot of the simulation: Lab Procedure Part 1- Changes in Potential and Kinetic Energy: 1. Make sure the simulation is on the tab Introduction. 2. Check the speed and the pie chart application boxes. 3. Click and drag the skater to the top of the ramp’s left side. Your screen should look like this. 4. Now release. 5. Observe what is happening to the speed and energy levels of the skater in motion.
College Physics -1 (PHY200L) Baptist Health Science University 6. Check the Grid box. 7. Use slow motion and the pause/play button to help you fill in the following table: The Skater’s Height in Meters Is there more potential or kinetic energy? 5 Potential 4 Potential 3 Potential 2 kinetic 1 Kinetic 0 Kinetic Part 1 Questions 1. When the skater is at the ____top_______ (top, bottom) of the ramp, potential energy is at its highest level. 2. Where is the skater at the __bottom_________(top, bottom) of the ramp, kinetic energy is at its highest level. 3. What is the relationship between speed and the kinetic/potential energies of the skater? 4. As the skater moves down the ramp and gains speed, the potential energy decreases while the kinetic energy increases. Conversely, as the skater moves up the ramp and slows down, the kinetic energy decreases while the potential energy increases. Lab Procedure- Part 2- determining the Effect of Mass 1. Reset all. 2. Set skater mass to small.
College Physics -1 (PHY200L) Baptist Health Science University 3. Click on bar graph application. Your screen should look like this. Click on “speed” 4. Place skater on top of the ramp. 5. Repeat for a medium mass and large mass skater. Part 2 Questions 1. The speed of the skater remains the same_(increases, decreases, remains the same) when the skater’s mass increased. 2. The total energy level of the skater _increases________ (increases, decreases, remains the same) when the skater’s mass increased. 3. What can you conclude about the relationship between the mass of the skater and the energy level? a. There is a positive relationship between the mass of the skater and the total energy level. As the mass of the skater increases, the total energy level also increases. However, the speed of the skater remains the same regardless of the skater's mass. Lab Procedure- Part 3- The Effect of Friction 1. Click the “Friction” tab on the top of the simulation. 2. Click “On” below Friction to add the element of friction to the ramp, make sure the friction level is set to “none” 3. Check the bar graph box 4. Check the Grid Box. Your screen should look like this:
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College Physics -1 (PHY200L) Baptist Health Science University 5. Click and drag the skater to the top of the ramp, now release. Part 3 Questions Fill in the table below. Every time you alter the friction level, reset all and check the bar graph and the grid. (The first row is done for you) Friction Level Number of times Skater passes middle of the ramp until he stops Highest point of Skater first time he goes to the right side of ramp? (Use red dot in middle of skateboard for your measurement) What is happening to the energy levels? Total: remains the same KE: increasing and decreasing oppositely than potential PE: increasing and decreasing oppositely than kinetic ThE: not present None Infinite approximately 5.5 meters Quarter way toward Lots 38 Approx. 5.5 m Total: remains the same KE: increasing/decreasing oppositely than potential PE: increasing/decreasing oppositely than kinetic
College Physics -1 (PHY200L) Baptist Health Science University ThE: increases each time he passes the middle point of ramp Half Way toward Lots 17 Approximately 4.5 m Total: Remains the same KE: increases as potential decreases PE: increases as potential decreases ThE: increases each time he passes the middle point of ramp Three Quarters toward Lots 12 Approximately 4m Total: Remains the same KE: increases as potential decreases PE: increases as potential decreases ThE: increases each time he passes the middle point of ramp Lots 8 Approximately 3.5 meters Total: Remains the same KE: increases as potential decreases PE: increases as potential decreases ThE: increases each time he passes the middle point of ramp Wrap Up Questions 1. What is the relationship between friction and thermal energy? Friction can produce thermal energy when two objects rub against each other. The mechanical energy generated by the friction between the two objects is converted into heat energy or thermal energy. This heat energy is commonly referred to as thermal energy. 2. If you were sitting on the couch and someone said, “You have no energy.” Would you agree or disagree with this statement? What might you say in response? "If someone were to say to me, "You have no energy," while I am resting on the couch, I would reply that even though I may not be physically active or exerting much energy, I still possess potential and thermal forms of energy. I would explain that my body contains potential energy that can be used later, and even while resting, my body's metabolic processes are generating thermal energy."