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