Energy and Collisions Puzzle

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Across
  1. 3. energy stored in the position of an object
  2. 5. a force acting between two surfaces in contact.
  3. 7. Usable power that can be transferred or converted to different forms, but cannot be create or destroyed
Down
  1. 1. when one object hits another
  2. 2. energy of motion
  3. 4. any factor that can be changed
  4. 6. a unit of kinetic energy