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