Forces of Nature

1. Kepler stole planetary data collected by this scientist after his death.
3. The particle associated with electromagnetic forces.
6. Aristotle's book, ________, was used for almost 2000 years by scientists.
10. Kepler's 2nd law describes how a line from the sun to a planet sweep out equal _______ in equal times.
12. The model that describes all bodies orbiting around the sun.
14. The idea that simpler theories are better than overly complicated ones.
16. The weakest fundamental force of nature.
17. If the distance between two objects is halved, the gravitational force between them __________.
18. Particles "w" and "z" associated with the weak nuclear force.
19. Kepler found that planets travel in _______ around the sun and not circles.
20. "m" in the Law of Gravitation.

2. Gravity is an _________ force.
4. Tides with less variation since the sun and moon are perpendicular to one another.
5. "q" in Coulomb's law.
7. Two electrons will _______ one another.
8. Extra high and extra low tides due to the alignment of the sun and moon.
9. Has magnitude and direction.
11. The strongest fundamental force of nature.
13. This also conforms to an inverse square law, "What did you say?"
15. One of the particles associated with the strong nuclear force.