Question

true=10 points false=5 points

1. mechanical energy requires movement
2. you can collect solar energy at night
3. thermal energy is also light energy
4. how high or low a sound is would be vibration
5. a burning match has kinetic energy
6. electrical energy requires an electric current
7. hydroelectric energy comes from wind
8. the food you eat has chemical energy
9. heat flows through a conductor well
10. heat flows through an insulator well
11. conduction requires objects to be touching
12. radiation requires circulating gases and liquids
13. convection requires objects to be touching
14. taking heat away from water would make it freeze
15. adding heat to water would make it evaporate

Explanation:

1. Mechanical energy is the sum of kinetic (movement) and potential energy. So, mechanical energy requires movement.
2. Solar energy is collected from sunlight. At night, there is no sunlight.
3. Thermal energy is heat energy. Light energy is electromagnetic radiation.
4. How high or low a sound is (pitch) is related to frequency. Vibration is related to sound production.
5. A burning match has chemical energy being converted. Kinetic energy is energy of motion.
6. Electrical energy is the energy derived from electric potential energy or kinetic energy of charged particles. It requires an electric current.
7. Hydroelectric energy comes from water. Wind energy comes from wind.
8. Food has chemical energy which is converted during digestion.
9. Conductors allow heat to flow through them well.
10. Insulators do not allow heat to flow through them well.
11. Conduction is the transfer of heat through direct contact.
12. Radiation is the transfer of heat in the form of electromagnetic waves. Convection requires circulating gases and liquids.
13. Convection is the transfer of heat through the movement of fluids (liquids or gases).
14. Removing heat from water (below 0°C at standard pressure) causes it to freeze.
15. Adding heat to water (above 100°C at standard pressure) causes it to evaporate (boil).

Answer:

1. True
2. False
3. False
4. False
5. False
6. True
7. False
8. True
9. True
10. False
11. True
12. False
13. False
14. True
15. True