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1. Do you think the Skater will make it over the first hump? ( No friction on the track)

1. Do you think the Skater will make it over the first hump? ( No friction on the track). No, because his potential energy will be converted to thermal energy No, because he doesn’t have enough potential energy Yes, because all of his potential energy will be converted to kinetic energy

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1. Do you think the Skater will make it over the first hump? ( No friction on the track)

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  1. 1. Do you think the Skater will make it over the first hump?(No friction on the track) • No, because his potential energy will be converted to thermal energy • No, because he doesn’t have enough potential energy • Yes, because all of his potential energy will be converted to kinetic energy • Yes, because some of his energy will be potential and some kinetic

  2. 2. Do you think the Skater will make it over the first hump?(lots oftrackfriction) • No, because his potential energy will be converted to thermal energy • No, because he doesn’t have enough potential energy • Yes, because all of his potential energy will be converted to kinetic energy • Yes, because some of his energy will be potential and some kinetic

  3. 3. Do you think the Skater will make it over the first hump?(No friction on the track) • No, because his potential energy will be converted to thermal energy • No, because he doesn’t have enough potential energy • Yes, because all of his potential energy will be converted to kinetic energy • Yes, because some of his energy will be potential and some kinetic

  4. 4. Do you think the Skater will make it over the first hump?(lots oftrackfriction) • No, because his potential energy will be converted to thermal energy • Yes, if not too much energy is converted to thermal • Yes, because all of his potential energy will be converted to kinetic energy • Yes, because some of his energy will be potential and some kinetic

  5. 5. In the next moment, the KE piece of the pie gets larger, then • The Skater is going up hill (left) • The Skater is going down hill (right) • There is no way to tell

  6. 6. In the next moment, the KE piece of the pie gets larger, then • The PE part stays the same • The PE part gets larger too • The PE part gets smaller • There is no way to tell

  7. 7. In the next moment, the KE piece of the pie gets larger, then • The Skater will be going faster • The Skater will be going slower • There is no way to tell

  8. A B C D E 8. The dotted line on the chart shows the energy of the Skater, where could she be on the track?

  9. A B C D E 9. The bar graph shows the energy of the Skater, where could she be on the track?

  10. A B C D E 10. The pie graph shows the energy of the Skater, where could she be on the track? KE PE

  11. PE KE A. B. C. D. 1 3 4 2 11. If the ball is at point 4, which chart could represent the ball’s energy?

  12. 1 3 4 2 12. If a heavier ball is at point 4, how would the pie chart change? KE • No changes • The pie would be larger • The PE part would be larger • The KE part would be larger PE

  13. At 4 Next step 1 3 4 2 13. As the ball rolls from point 4, the KE bar gets taller. Which way is the ball rolling? • Up • Down • not enough info

  14. 14. The Energy chart of a boy skating looks like this How would you describe his speed? • He is at his maximum speed • He is stopped • He is going his average speed • He is going slow • He is going fast

  15. 15. The Energy chart of a boy skating looks like this How would you describe his speed? • He is at his maximum speed • He is stopped • He is going his average speed • He is going slow • He is going fast

  16. C B A 16. Select a letter for each: stopped, slow and fast Stopped Slow Fast

  17. Energy vs Position 17. Sketch this energy position graph. Label where the 5 spots, A-E, could be PE KE • He is going his maximum speed • He is stopped • He is going his average speed • He is going slow • He is going fast

  18. Pendulum height 18. How high will pendulum rise? A) Less than h B) h C) More than h h Reference level (h = 0)

  19. 19. A 5000 kg coaster is released 20 meters above the ground on a frictionless track. What is the approximate speed at ground level? (point A) Velocity from PE • 7 m/s • 10 m/s • 14 m/s • 20 m/s • none of the above

  20. 20. What is its approximate speed at 10 meters high (point B )? A)7 m/s B)10 m/s C)14 m/s *Correct answer but not the right sig figs D)20 m/s E)none of the above

  21. 21. How fast would the coaster have to be going at the start to reach 21 meters high (point C)? • A)1.1 m/s • B)  3.2 m/s • C)  4.5 m/s • D)   20 m/s

  22. Pendulum speed 22. Calculate velocity at B if h = 0.45 m, g = 10 m/s2 A) 3 m/s B) 4.5 m/s C) 7.5 m/s D) 9 m/s A h B Reference level (h = 0)

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