1. Science Review Chapter 3 ENERGY

2. Which of these is an example of potential energy changing to kinetic energy? a. A roller coaster car pauses at the top of a hill and then rolls down. b. A driver stops her car at a stop light. c. One horse runs faster than another horse. d. A football player runs faster to make a touchdown.

3. In the afternoon when the sun is in the western sky, a tree’s shadow stretches to the ______. a. west b. east c. north d. south

4. Most objects that give off light also give off a. heat b. sound c. electricity d. mechanical energy

5. Something that makes a loud sound vibrates a. at a high frequency b. at a low frequency c. with a lot of energy d. with a little energy

6. A student wires together a light bulb and a battery to form a circuit. The light bulb does not light up. What does this mean? a. The circuit is closed. b. The circuit is open. c. The circuit is mechanical. d. The circuit has a constant current of electricity.

7. You buy a white shirt. Which of these is true about your white shirt? a. The shirt refracts any light it hits. b. The shirt reflects white light only. c. The shirt reflects all colors of light. d. The shirt absorbs all colors of light.

8. Why is plastic a good material for the covering of a wire? a. plastic attracts an electric charge b. plastic carries an electric current c. plastic is a conductor d. plastic is an insulator

9. In what form does energy from the sun travel to Earth? a. thermal b. light c. heat d. electrical

10. What can you feel after you rub an eraser against a paper? a. heat b. light c. potential energy d. electricity

11. Which of these objects changes electrical energy to mechanical energy? a. a lamp b. a bicycle c. a fan d. a radio

12. How does light travel? a. in one direction away from the source b. in all directions toward the source c. in all directions from the source d. in one directions toward the source

13. Which of these objects absorbs all colors of light? a. tire of a car b. stem of a plant c. cloud in the sky d. leaf of a tree

14. Which of the following best demonstrates potential energy? a. a rolling ball b. a moving car c. a running boy d. a sleeping cat

15. How are conductor and insulators different? a. electrical charges move easily through insulators and not through conductor. b. electrical charges cannot move through either. c. electrical charges move easily through conductors and not through insulators. d. electrical charges move easily through both.

16. TRUE OR FALSE A drum produces sound energy. TRUE

17. TRUE OR FALSE A rubber band is a conductor. FALSE

18. TRUE OR FALSE Shadows are shortest at noon. TRUE

19. TRUE OR FALSE Water is transparent. TRUE

20. TRUE OR FALSE A metal is an insulator. FALSE

21. TRUE OR FALSE A running boy is potential energy. FALSE

22. BONUS ROUND 100 POINTS Name an object in which you can see your reflection and another object that does not produce your reflection. TELL WHAT CAUSES THE DIFFERENCE. I can see my reflection in the shiny side of a CD because the reflected light travels together in the same direction. I can’t see my reflection on the top of my desk because the reflected light is in different directions.

23. BONUS ROUND 100 POINTS Explain the difference between an open circuit and a closed circuit. A closed circuit is a circuit with no breaks or gaps, and it allows for the electricity to flow. An open circuit is where there is a break in the circuit which will not allow for the electricity to work. REMINDER! Think of our switches REMINDER! Think of our switches