The Study of Physics

2. A system of millions or billions of stars.
3. Force due to gravity.
5. The most fundamental particles now known.
9. Any system that uses a low power input signal to control a hlgher power output.
10. Measured by force/area.
11. A theory that states: a ball of matter was so hot that it blew apart. The bang was so big that the largest chunks to fly away were the size of atoms.
12. The number of cycles of a periodic wave occurring per unit time is defined as a waves.
13. It's made up of all the planets that orbit our sun.
15. Energy of speed, 1/2 mv^2.
16. Defined as mass in motion.
18. The international unit of measure for force.
20. A technical term for weight.

1. What is a single disturbance that moves from point to point through a medium?
4. The force that pulls objects towards each other.
6. Combination of atoms.
7. The force between two rubbing surfaces.
8. A flow of electric charge.
9. The rate in which the the velocity changes.
14. A measure of how much a force acting on an object causes that object to rotate.
17. SI unit of electric potential or electromotive force.
19. The unit of power.