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- 1. Conservation of Energy<br />
- 2. Changing Forms of Energy<br />Energy is most noticeable as it transforms from one type to another.<br />What are some examples of transforming electrical energy?<br />A lightbulb<br />A hair dryer<br />
- 3. Changing forms of Energy<br />An example of transforming chemical energy is a car engine. Chemical potential energy in gasoline is transformed into kinetic energy of the car as it moves!!<br />
- 4. KE and PE<br />In many situations, there is a conversion between potential and kinetic energy.<br />The total amount of potential and kinetic energy in a system is called the mechanical energy<br />Mechanical energy = PE + KE<br />
- 5. Mechanical Energy<br />Mechanical energy is due to the position and motion of the object.<br />What happens to the mechanical energy of an apple as it falls from a tree?<br />
- 6. Mechanical Energy<br />As the apple falls to the ground, its height decreases. Therefore, its GPE decreases.<br />The potential energy is not lost… it is converted into kinetic energy as the velocity of the apple increases.<br />What happens to the mechanical energy?<br />
- 7. Mechanical Energy<br />The mechanical energy does not change because the loss in potential energy is simply transferred into kinetic energy.<br />The energy in the system remains constant!!<br />The total amount of energy stays the SAME!!<br />
- 8. Swinging Along<br />Think about the changes in energy when you are on a swing…<br />At what point do you have the most potential energy?<br />At what point do you have the most kinetic energy?<br />What happens to the mechanical energy?<br />
- 9. The Law of Conservation of Energy<br />The Law of Conservation of Energy states that energy cannot be created or destroyed.<br />The big picture… the total energy in the universe remains constant.<br />
- 10. But how? If I stop pumping while I’m swinging, I stop!! So, where’s the energy?<br />
- 11. Conservation of Energy<br />You need to remember friction…<br />As you slow down on the swing, the hooks and the chain rub against each other and air pushes against the rider.<br />
- 12. Friction causes some of the mechanical energy of the swing to change to thermal energy and the temperature of the hooks and chain heat up a little.<br />The energy is still there, just in a different form!! <br />
- 13. Conservation of Energy<br />Energy is transformed… not destroyed!!<br />The total amount of energy stays the SAME!!<br />
- 14. Energy in Your Body<br />Even the energy converted in your body follows the law of conservation of energy.<br />Chemical potential energy is transferred to kinetic energy that allows your body to move!!<br />
- 15. Calories…<br />A Calorie (C) is a unit to measure energy in foods.<br />1 Calorie is equal to about 4,184 Joules.<br />A person uses about:<br />55 Calories while sleeping for 1 hour<br />210 Calories while walking for 1 hour<br />850 Calories while running for 1 hour<br />

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