Lab 8 Mechanical Energy (Using Ph ET) PDF

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Lab 8: Mechanical Energy (Using PhET Simulation Tool) Objective: Using PhET online simulation tool (Energy Skate Park) to study kinetic energy and gravitational potential energy. Learn about conservation of energy with a skater dude! Build tracks, ramps and jumps for the skater and view the kinetic energy, potential energy and friction as he moves. You can also take the skater to different planets or even space! • • • • •

Energy Conservation of Energy Kinetic Energy Potential Energy Friction

Set up the simulation tool Go to PhET and find the Energy Skate Park simulation. Or click the following link https://phet.colorado.edu/en/simulation/legacy/energy-skate-park

You will see

Click download. If you cannot run the simulation, you may need to follow the following PhET help guiding line:

https://phet.colorado.edu/en/help-center/running-sims

Click Follow the guiding line. You should find the solution for your computer/laptop. The simulation lab should looks as the following

Online simulation: From above staring image 1. 2. 3. 4.

Click the checkbox “Potential Energy Reference”. You will see where y-zero level is. Click the checkbox “Measure Tape”. You can use it to measure y-value. Given you three positions: A, B, C. Measure the vertical y values at A, B, C, and put it in the table

A

C

B

5. Now click the “Energy vs. Position” and you will see

6. This “Energy vs. Position” picture tell you the information about Total energy, kinetic energy, and potential energy (here is gravitational potential energy). Thermal energy should set to zero by default. From the curve find out the energy at A, B, C, and put to the table. 7. Based on the information you collected. Calculate the mass of the skater. What equation you use for this calculation? And witch column(s) data you need to use. 8. Click the “Choose Skater” pushing button, and record the mass of the skater. 9. Compare with the mass you calculated and find the % error. 10. Based on the information you collected. Calculate the velocity of the skater. What equation you use for this calculation? And witch column(s) data you need to use. 7. The mass I calculated was 130.40 kg. I used the equation m=PEg/gh using 4,000 J for PE, 3.13 for h and 9.8 for gravity. Data Table

A B C

y-value (m)

Potential Energy (J)

Kinetic Energy (J)

Total Energy (J)

Mass of skater

3.13

4,000

0.0

4,000

75kg

5.92

1,000

3,000

4,000

75kg

3.13

4,000

0.0

4,000

75kg

velocity

8.94 m/s

9. I calculated the percent error to be 73.87%.

10. I used the equation v= square root of (KE/0.5m). I used 3,000 for kinetic energy and 75 for mass....