M3.5 Laboratory Report 7 Worksheet
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Broward College *
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PHY2053
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Aerospace Engineering
Date
Dec 6, 2023
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docx
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6
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Name: _____Janice Cruz _____________________________________ M3.5 Laboratory Report 7 Worksheet
PhET Simulation: Conservation of Energy
Instructions
You should download this page and complete all your work directly on the MS Word worksheet using MSWord, following the M3.5 Laboratory Report 7 Instructions.
Submit your completed Word document to the M3.5 Laboratory Report 7 dropbox. See the Schedule and Course Rubrics in the Syllabus Module for due dates and grading information.
Objectives:
1.
Explain the Conservation of Mechanical Energy concept using kinetic and gravitational potential energy.
2.
Calculate speed or height from information about a different position. 3.
Investigate and describe how different gravity fields and friction affect the energy distribution. 4.
Investigate and describe how different mass affect the energy distribution. 5.
Explain the energy graphs.
Pre-Lab Activities:
1.
Open the simulation using the link to PhET Interactive Simulations at the University of Colorado Boulder:
https://phet.colorado.edu/sims/html/energy-skate-park/latest/energy-skate-park_en.html
2.
Select Intro and explore the options available in the simulator.
3.
Observe what happens with the energy with the changing height, mass, gravity and friction. Check with different shapes of the ramps.
Include your observations and conclusions in the completed laboratory report.
Part I: Dependance of height, mass, friction, gravity, and mass.
1.
Open the simulation using the link to PhET Interactive Simulations at the University of Colorado Boulder:
https://phet.colorado.edu/sims/html/energy-skate-park/latest/energy-skate-park_en.html
2.
Select Measure tab and explore the options available in the simulator.
3.
Check Grid, Reference Height, Pie chart, Speed, as shown on the screenshot below. Use the purple Energy measurement tool to measure the energies at different points on the ramp. Use the Slow-Motion selection and pause at the desired height to obtain the measurements.
1.1 Dependance of height.
Choose the ramp shown on the screenshot and release the skater from 3 different heights. Use
the Energy measuring tool, pause to obtain the data and fill in Table 1.
Energy (J)
Height 6 m
Height 4 m
Height 2 m
Kinetic
493.7 J
1579.4 J
2689.3 J
Potential
3487.3 J
2401.6 J
1227.3 J
Total
3981.0 J
3981.9 J
3981.0 J
Table 1
Describe the results and write your conclusions in the laboratory report.
1.2 Dependance of Friction
Using the same ramp, place the slider for Friction to None, in the middle of the slider and to
Lots.
Release the skater from the same height for all 3 friction set ups and record the data in Table 2.
Energy (J)
Friction - None
Friction-Medium
Friction-Lots
Kinetic
37.3 J
30.4 J
28.9 J
Potential
2371.3 J
2375.2 J
2376.0 J
Thermal
0.0 J
2.9 J
3.6 J
Total
2408.6 J
2408.6 J
2408.6 J
Table 2
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Describe the results and write your conclusions in the laboratory report.
1.3 Dependance of Gravity.
Keeping the other variables (mass, height, friction-none) the same, change the gravity settings and record the measured data in Table 3.
Energy (J)
Moon
Earth
Jupiter
Kinetic
1.0 J
37.8 J
241.8 J
Potential
392.0 J
2369.6 J
5858.2 J
Total
393.0 J
2407.3 J 6092.0 J
Table 3
Describe the results and write your conclusions in the laboratory report.
1.4 Dependance of Mass.
Keeping the other variables (gravity, height, friction-none) the same, change the mass 3 times
settings and record the measured data in Table 3.
Energy (J)
Mass = 25 kg
Mass = 55 kg
Mass = 85 kg
Kinetic
15.7 J
34.6 J
53.3 J
Potential
987.3 J
2172.1 J
3356.9 J
Total
1003.1 J
2206.7 J
3410.4 J
Table 3
Describe the results and write your conclusions in the completed laboratory report.
Part II: Calculate speed or height from information about a different position.
Choose a ramp, skater, and gravity. Set the friction to none. Release your skater and use the Energy measuring tool to measure the energy at one point of the ramp.
Use the formula for Potential energy and the measured value for that energy and calculate the height. Does your result match the height detected in the simulator?
Use the formula for Kinetic energy and the measured value for that energy, calculate the speed and compare to the measured value.
Describe the results and write your conclusions in the completed laboratory report.
Part III: Energy Graphs
1.
Select Graphs tab and explore the options available in the simulator.
2.
Release the skater and plot the Position graph (see screenshot below)
3.
Release the skater and plot the Time graph (see screenshot below)
Describe what each graph represents and the meaning of the curves. How the graphs represent the conservation of energy?
Discuss the results and write your conclusions in the completed laboratory report.
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