Across
- 2. a process by which wind is used to generate electricity
- 4. when a force is exerted on an object
- 8. toothed wheels that alter the relation between the speed of a driving mechanism and the speed of driven parts
- 10. ratio of force produced by a machine to the force applied to it
- 11. any interaction that will change the motion of an object
- 12. energy by burning organic materials from plants and animals
- 13. containing or operated by air of gas under pressure
Down
- 1. a bar resting on a pivot used to move heavy load; a simple machine
- 3. energy generated and stored in the Earth
- 5. radiant energy emitted by the Sun
- 6. energy released during fission or fusion
- 7. energy generated by the conversion of free-falling water
- 9. a form of hydropower that converts the energy obtained by tides into useful forms of power