Machines Crossword

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Across
  1. 3. The sun, burning coal and wind are used to generate this
  2. 5. A see-saw is an example of a "First Order -----"
  3. 7. Machines are never 100% efficient due to --------
  4. 9. A simple machine that rolls easily
  5. 10. The rod that goes through a wheel and allows it to turn
  6. 11. Machines make work easier, meaning we don't have to exert as much -----
Down
  1. 1. The simple machine that uses a wheel and a rope to lift heavy loads
  2. 2. A shaft with ridges around it, used to fasten two surfaces together
  3. 4. A ramp that makes it easier to move objects upwards
  4. 6. Converts electrical energy into mechanical motion (Hint: under the bonnet)
  5. 8. An axe is an example of this simple machine