17. Kinetic-Potential Energy Conversion Roller coasters work because of the energy that is built into the system. Initially, the cars are pulled mechanically up the tallest hill, giving them a great deal of potential energy. From that point, the conversion between potential and kinetic energy powers the cars throughout the entire ride.
18. Kinetic vs. Potential Energy At the point of maximum potential energy, the car has minimum kinetic energy.
21. Bellwork: Use the illustration below to answer the questions. 1. ___ Which letter in the diagram represents the place where the cars on the roller coaster would have the most potential energy? 2. ___ Which letter represents the place where the cars would have the least kinetic energy? 3. ___ Where in the diagram would the cars be moving with the greatest speed?
22. So…… Why do you think that the first hill on the roller coaster must be the tallest? (Explain your answer in terms of kinetic and potential energy.)
23. Objective: You will calculate potential energy and kinetic energy using their respective formulas.
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25. Objective: You will identify the five main forms of energy and explain the energy conversions taking place in different scenarios.
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29. Mechanical Energy When you throw a bowling ball, you give it energy. When that bowling ball hits the pins, some of the energy is transferred to the pins (transfer of momentum).
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31. Physical state: Melting ice at 0° C Bonds between molecules: Bonds in regular structure breaking (requires heat energy)
32. Physical state: Liquid water at 0° C Bonds between molecules: Many bonds forming and breaking randomly
33. Physical state: Liquid water at 20 ° C Bonds between molecules: Many bonds forming and breaking randomly
34. Physical state: Liquid water at 100 ° C Bonds between molecules: Many bonds forming and breaking randomly
35. Physical state: Boiling water at 100° C Bonds between molecules: Remaining bonds are breaking (requires heat energy)
36. Physical state: Water vapor at 100° C Bonds between molecules: None
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38. Where is the energy stored in these hydrocarbons? THE BONDS
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44. Nuclear Energy The sun’s energy is produced from a nuclear fusion reaction in which hydrogen nuclei fuse to form helium nuclei.
58. The flower pot on the right is at a higher gravitational potential energy than the one on the left because it is at a higher position. So, the potential energy that each pot has is a function of its vertical position.
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