Energy, Power and Mechanics crossword puzzle

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Across
  1. 4. Strength or energy used for physical action or movement
  2. 7. Energy from wind
  3. 8. Renewable energy source from plants and animal materials
  4. 11. Energy transfer that occurs when an object is being moved
  5. 12. Electricity that is produced by water.
  6. 13. The ratio of force produced by a machine to the force that was put into it.
Down
  1. 1. Energy that comes from the sun
  2. 2. A simple machine that uses a bar
  3. 3. The branch of physics that is concerned with the properties of gases
  4. 5. A form of hydro power
  5. 6. Energy that is stored in the Earth
  6. 9. A wheel with teeth that work together to make a machine work faster
  7. 10. Energy released from nuclear fusion