Skate Park Practice Problems

1. Skate Park Practice Problems

2. Skate Park Lab • 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

3. Skate Park Lab • 2. Do you think the Skater will make it over the first hump?(lots of track friction) • 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. Skate Park Lab • 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

5. Skate Park • 4. Do you think the Skater will make it over the first hump?(lots of track friction) • 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

6. 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

7. 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

8. 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

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

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

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

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

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

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

15. 7. 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. 8. 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

17. 9. Select a letter for each: stopped, slow and fast C B A B A C

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

19. Pendulum height 1. How high will pendulum rise? A) Less than h B) h C) More than h h Reference level (h = 0)