Introduction to energy

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Across
  1. 2. the rate of doing work
  2. 5. the quality of being hot
  3. 8. energy of an object due to its mass and speed
  4. 10. a natural gas such as coal
  5. 13. energy that travels in electromagnetic waves
  6. 14. a simple machine made of a rigid beam and a fulcrum.
  7. 15. the process by which energy is transmitted through collision
Down
  1. 1. the amount of energy is neither created nor destroyed
  2. 3. is the process where energy changes from one form to another
  3. 4. the sum of kinetic and potential energy
  4. 6. energy in form of heat
  5. 7. physical quantity that expresses hot and cold
  6. 9. the movement cause by a fluid by the tendency of hotter and less dense material
  7. 11. the ability to do work
  8. 12. material that permits a flow of energy