Across
- 5. Mathematical object with mass but zero volume.
- 9. Sectors swept out during equal time in orbit are equal areas.
- 13. Force per unit mass.
- 14. Force field that exists around bodies with mass.
- 15. Along the circumference of a circle.
- 16. Path of a moving body revolving around another, attracted to one another by gravity.
Down
- 1. Orbit above the equator with period 24 hours in the direction of the rotation of the Earth.
- 2. Equal and opposite attractive force between two masses.
- 3. Force on a body directed towards the centre of a circular path.
- 4. Arrow showing the direction of force experienced by a test mass.
- 6. Square of th eorbital period is proportional to the cube of the semimajor axis.
- 7. Motion affected by the force of gravity alone.
- 8. Quantity of matter in a body.
- 10. All planet orbits are elliptical, with the sun at one focus.
- 11. Time to complete one cycle of motion.
- 12. Moon, planet or machine that orbits a planet or star.