Machines and energy

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Across
  1. 5. the first wheel was invented in this period
  2. 6. this person invented the electric motor
  3. 7. this type of energy is non-renewable
  4. 9. you use it to split or cut an object
  5. 10. this type of energy is renewable
  6. 12. a bar which moves on a fixed point
  7. 13. is made up of a rope and one or more wheels
Down
  1. 1. we use it to move objects from one level to another
  2. 2. this makes it faster and easier to transport objects
  3. 3. we use it to join two objects together
  4. 4. william roentgen discovered this
  5. 8. machines apply force to another object and make it move
  6. 11. machine this machines remove heat