Across
- 4. F1=F2=G(m1m2/r^2)
- 8. The force of attraction between all masses of the universe.
- 9. Device that uses electromagnetic fields to propel charged particles.
- 10. Best known for their role in nuclear decay.
- 11. The interaction of charged particles and of magnetic fields.
- 15. When the nucleus of an unstable atom loses energy.
Down
- 1. weak force
- 2. A model of the planets revolving around the sun.
- 3. Force stronger than the weak force interaction and gravitation.
- 5. F=G(m1m2/r^2)
- 6. An object placed into orbit.
- 7. When two nuclei of an atom collide to produce one or two more nuclides
- 12. Susceptibility of a body to one of the fundamental forces.
- 13. The orbit of the planets with the sun at one focal point.
- 14. Elementary particle and a fundamental constituent of matter.