Derek's puzzle

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Across
  1. 4. Unit of work
  2. 5. the rate at which work is done.
  3. 10. The pivot point
  4. 12. The input-output distance ratio. Is the mechanical _________
  5. 14. kinetic energy of motion.
  6. 15. The ability to do work.
Down
  1. 1. Whenever work is done, energy changes is known as the work-energy ______
  2. 2. potential energy that is stored and ready to be used.
  3. 3. Law of ____________ of energy states that energy cannot be created or destroyed.
  4. 6. done against another force.
  5. 7. is the ratio of useful work output to total work input.
  6. 8. unit for power.
  7. 9. It is a machine.
  8. 11. the ratio of useful work output to total work input.
  9. 13. basically a kind of lever that can be used to change the direction of the force.