Fields: D4 - Gravity

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