Across
- 2. an object's mass when it is measured at rest
- 3. states that the earth is the center of the solar system
- 4. resistance to start sliding
- 6. describes motion
- 9. equation that shows relationship between gravitation, two masses, and the distance between the center of masses
- 14. the closest position to the sun in a planet's orbit
- 15. force that is the weakest and exists between two bodies of matter
- 17. farthest position from the sun in a planet's orbit
- 18. orbit of every planet has an elliptic shape
- 19. time required to complete one orbit around the sun
- 20. the force exerted on an object's mass by earth's gravity
- 21. acts against every object in motion in the opposite direction to slow it down
- 22. push or pull
- 23. body's tendency to maintain velocity
- 24. force that is the cement that holds an atomic nucleus together
- 25. amount of matter in an object
Down
- 1. resistance to sliding
- 5. seeks to explain motion by describing its causes
- 7. states that the sun is the center of the solar system
- 8. force that exists only between electrically charged bodies
- 10. motion where your center of gravity is not supported
- 11. force that is responsible for certain particle interactions in the radioactive decay of atomic nuclei
- 12. attractive forces between any two masses
- 13. force of the surface against the weight of an object and it is always perpendicular to the object
- 16. planets closer to the sun have a shorter period of orbit than planets farther away
- 18. an imaginary line connects a planet to the sun