4.3: Conservation of Energy

1. What does the law of conservation of energy state? Select all that apply.

2. Does the mechanical energy of an apple falling from a tree change? Explain.

What energy is stored in gasoline?

What energy is released when the fuel is ignited and the gases expand?

Now that the expanding gases cause the car to move, what energy is this?

7) What is the 3 step energy transformation involved in running a car engine?

9. How are work and power related? Select all correct answers

Bonus Q: What are the TWO possible units of power?

1. Energy can never switch back and forth between kinetic and potential

2. As energy changes from one form to another, some of it might be lost/destroyed

3. The law of conservation of energy describes what happens to energy as it changes form or is transferred from one object to another

4. Mechanical energy is the total amount of potential and kinetic energy in a system

5. The total potential energy an apple had before it fell, is NOT the same as the total kinetic energy it had upon hitting the ground (meaning, its total mechanical energy did not remain constant constant

6. When riding on a swing, kinetic energy is the lowest at the top of the swing

7. When a moving object slows down due to friction, its mechanical energy transforms into thermal energy

8. A light bulb transforms electrical to light (and heat) energy

9. Cars operate by transforming nuclear energy into kinetic

10. Power describes the rate at which energy is used