Across
- 3. Force attracting objects
- 4. System of stars and planets
- 6. Change in object's position
- 7. How fast something moves
- 9. Collection of parts working together
Down
- 1. Opposes motion between surfaces
- 2. Mathematical equation
- 3. Keeps the planets in orbit
- 5. Entire cosmos
- 8. Newton's main field of study