In this lab you will verify and apply the conservation of energy theorem. To do the lab you need to use the "Energy Skate Park: Basics"...
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This is a physics assignment about conservation of energy. I have done up to question 10. The rest however I am not sure wha the answers are. Screen Shot 2020-03-31 at 12.31.58 PM.pngScreen Shot 2020-03-31 at 12.32.20 PM.pngScreen Shot 2020-03-31 at 12.32.32 PM.pngScreen Shot 2020-03-31 at 12.32.59 PM.pngScreen Shot 2020-03-31 at 12.33.13 PM.pngScreen Shot 2020-03-31 at 12.33.24 PM.pngScreen Shot 2020-03-31 at 12.33.46 PM.pngScreen Shot 2020-03-31 at 12.34.01 PM.png

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Lab 03 Conservation Laws Assignment: Conservation of Energy 25 total points, 25 questions, 1 point each You should begin work on the lab assignment described below only after you have finished Lesson 03 and can accomplish the learning objectives for this lesson. In this lab you will verify and apply the conservation of energy theorem. To do the lab you need to use the "Energy Skate Park: Basics" (uses html 5) simulation. Energy Skate Park: Basic (HTML5) Pie Chart 8 Bar Graph _Grid Speed Small Mass 2 W 0 meters Slow Motion Normal Restart Skater Energy Skate Park: Basics Intro Friction Playground PHET. = Start the "Energy Skate Park: Basic" simulation (opens in a separate window) and play with it to see what it does. When ready, reset everything. Select the "Intro" icon at the bottom of the simulation window and check the button for "Grid". Click and drag to place the skater (mass 50 kg) on the track, 6 m above the ground (position A). It will start moving when you let go: press the pause button and then the "Restart Skater" button. There is no friction between the track and the skater. In all calculations take a = 9.8 m/s2. You simulation settings should look like shown below:

Click Start and look at the motion of the skater. What type of energy does the skater have at the starting point (position A)? if) A. Kinetic energy 0 B. Gravitational potential energy if) C. Elastic potential energy D. None What type of energy does the skater have at the lowest point on the track (position B)? o A. Kinetic energy '7' B. Gravitational potential energy '7' C. Elastic potential energy A x ' D. None What type of energy does the skater have at any point between position Aand position B? O n, h A. Kinetic energy only B. Gravitational potential energy only C. Elastic potential energy only 0 D. Both kinetic and gravitational potential energy The skater (mass 50 kg) starts his motion from rest at a height of 6 m above the ground (position A). What is the gravitational potential energy of the skater at position A? x" A. 490.1 T' B. 58.8J O c. 294m '7" D. zero What is the gravitational potential energy of the skater at the bottom of the track (position B)? T A. 490 J '7 B. 58.8 J '7 c. 2940.] o D. zero What is the kinetic energy of the skater at position B? r\ ..-_.

6. What is the kinetic energy of the skater at position B? A' A. 490 J B. 58.8 J O c. 2940 J A D. zero "\1 7. What is the speed of the skater at position B? 5' A. 4.4 mls o B. 10.8 m/s '7' C.117m/s n' D.0m/s 8. What is the gravitational potential energy of the skater when on the track, 4 m above the ground (position X)? "\1 A. 490 J B. 980 J O c. 1960 J A D. 200 J "N 9. What is the kinetic energy of the skater at position X? "'1 A. 490 J o B. 980 J "'n C. 1960 J D. 200 J "'1 10. What is the speed of the skater at position X? /\ ' A. 4.4 m/s 0 B. 6.2 mls A ,' C. 8.8 m/s 7" D. 2.8 m/s 11. Click the "Friction" icon at the bottom of your simulation window. In this simulation there is friction between the track and the skater. Check the "Grid" and "Pause" buttons. Place the skater at 6 m above the ground on the track (position A). Select "Slow Motion". Start the simulation and as soon as the skater passes the bottom of the track, stop the simulation and continue it step by step until the skater reaches the maximum position on the right side (position C) and turns around. What is the maximum height the skater reaches on the right side of the track (position C)?

Kinetic A Potential OO O OOO OOO O Thermal O Total D. - 980 J C. 980 J B. - 735 J O A. 735 J 13. How much work was done by the force of friction when the skater moved from position A to positon C? D. 2695 J C. 2450 J B. 2205 J A. 1960 J 12. What is the gravitational potential energy of the skater at position C? D. 5.5 m C. 5 m B. 4.5 m A. 4 m Kinetic B Potential Thermal Total Kinetic Potential C Thermal The energy of the skater can be represented as a bar graph (individual bar for each type of energy). The next 5 questions refer to the same image. Total Kinetic D Potential Thermal Total Kinetic Potential m Thermal Total

Which one or the bar graphs corresponds to the skater at his Initial posmon (posmon A)? A.A B.B C.C D.D E. E .) >020.) Which one of the bar graphs corresponds to the skater at the bottom of a track (position B) that has iriction? A.A B.B C.C D.D E. E )>'f)'.)> Which one of the bar graphs corresponds to the skater being somewhere between position A and position B on a track with friction? A.A B.B C.C D.D E. E )2?!) D) Which one of the bar graphs corresponds to the skater coming to rest after moving a while on a track with friction? i) A.A B.B C.C D.D E. E ")2') )> Which one of the bar graphs corresponds to the skater being somewhere between position A and position B on a track without friction? A.A B.B C.C D.D E. E Di) 3")2') / \

Look at the bar graph shown below. Kinetic Potential Thermal Total 19. At any position along the track, what is the correct relationship between the energies represented in this graph? Consider the thermal energy (energy lost due to friction) as a negative value. 0 A. Kinetic + Potential — Thermal = Total (7 B. Kinetic + Potential = Total + Thermal A» C. Kinetic + Potential + Thermal = Total Consider the set up shown in the figure below. The skater is at 4 meters above the ground on a ramp without any friction (position A). When the skater reaches the bottom of the ramp (position B), he continues his motion on a horizontal track that has friction. Use this scenario to answer the next questions.

Consider the set up shown in the figure below. The skater is at 4 meters above the ground on a ramp without any friction (position A). When the skater reaches the bottom of the ramp (position B), he continues his motion on a horizontal track that has friction. Use this scenario to answer the next questions. 8 6 4 2 0 meters 20. What is the work done by the force of gravity when the skater moves from position A to position B? A. 1960 J B. 2771 J O C. OJ O D. - 1960 J O E. - 2771 J

21. What is the work done by the normal force when the skater moves from position A to position B? "t A.1960J a B. 2771.1 F' . 0.0.1 "t D.—1960J A .' E. — 2771 J 22. What is the kinetic energy of the skater when it reaches the bottom of the ramp (position B)? "t A.1960J a B.2771J "t C.—1960J f' ' D.—2771J 23. Once the skater reaches the bottom of the ramp, he continues his motion on a rough horizontal track until he stops (position C). Using the work kinetic energy theorem, find the work done by the force of friction on the horizontal track (from position B to position C). A A. 1960J A L,' B. 2771 J 0 C.—1960J A D.—2771J 24. The coefficient of friction between the track and the skater is 0.2. What is the magnitude of the force of friction between the track and the skater? A A. 490 N 7? B.10N A C. 98M 25. What is the maximum distance traveled by the skater on the horizontal track (from position B to positon C)? " A.4m A L,' B. 20m A C.196m Submit

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