Science

2. The force caused by air pushing against moving objects
5. A device to connect two wires together
7. Amount of matter in an object, measured in kilograms
9. The unit used to measure electric current
10. a roughly circular line, route, or movement that starts and finishes at the same place.
12. A force which tries to stop things sliding past one another
13. A source of electrical energy that cosists of more than one cell
15. A push or a pull that tries to change the position or shape of an object

1. To put a sub stance, such as oil, on a surface in order to reduce friction
3. Rain that contains dissolved nitric oxides or sulfur dioxide: these compounds make the rain acidic
4. A material that allows electricity to pass through
6. The force that pulls objects towards the earth
7. A piece of equipment for measuring current, voltage and resistance
8. The unit used to measure weight
11. A material that does not allow electricity to pass through
14. when some thing have______, it can make things move and cause things to change; all living things need energy to exist