Physics Crossword

1. a force between two solid surfaces trying to move across each other that tries to stop movement happening
3. at 90 degrees to something
7. a material through which it is very difficult or impossible for electricity to flow
11. having an unstable nucleus that will emit particles and waves to achieve a more stable nucleus
12. the rate of increasing velocity
13. containing no matter at all
15. a device used to observe waves and vibration
17. small particles from which everything is made

2. a material that allows electricity to flow through easily
4. coil of wire in a bulb that glows when electricity passes through it
5. the distance from one point on a wave to the same point on the next wave
6. complete conducting paths for electricity
8. the movement of heat in a fluid as the fluid expands and rises when warmed
9. the point around which something can turn or rotated
10. the amount of matter in an object
14. the number of waves or vibrations made each second
16. object often made of ice and rocks that orbits the Sun in an elongated orbit