Y9 Physics

2. Energy from the Sun.
3. Energy transferred via electrons moving.
6. Unit of speed where the time is in hours and the distance is in kilometers
9. A point about which something turns.
10. A machine where the load is bigger than the effort.
11. An energy resource that will not run out on a human timescale (e.g. solar power.)
14. Balance.
16. How fast something moves.
18. Unit representing the strength of a force.
19. Energy stored in moving things.
21. Fuels formed from decomposed organic material over millions of years.
22. An upward force in fluids; also called buoyancy.

1. The ratio of wasted to used energy.
2. A device that generates electricity when exposed to light.
4. The conversion of kinetic energy to heat between two objects in contact
5. Energy stored in e.g. food, fuel, batteries
7. A form of drag in an atmosphere.
8. Change speed.
12. A type of wave involving moving particles in a fluid.
13. Slows things down in a fluid.
15. Unit of speed where the time is in seconds and the distance is in metres.
17. A form of energy transfer via waves. Usually refers to its visible frequency range (420 THz to 750 THz).
20. Unit used to represent the moment of a force.