Across
- 6. A contact force that acts against the movement of an object.
- 9. half of the Earth, North or South.
- 11. Theory about the start of the universe.
- 12. Turning around on an axis.
- 15. The turning effect of a force.
- 16. The amount of mattter in an object.
- 19. A space with nothing in it, not even air.
- 20. Speed with a direction.
Down
- 1. The units of measurement of force.
- 2. An oval shape.
- 3. The change in velocity divided by time.
- 4. Any object that is in orbit around another object.
- 5. The path an object takes to move around another object.
- 7. A vertical force caused by gravity.
- 8. A quantity which has magnitude and direction.
- 10. The line that goes from the centre of a circle to its edge.
- 13. The imaginary line through the centre of the Earth between the north and south poles.
- 14. Radiation remaining from the Big Bang explosion.
- 17. A quantity which has magnitude but no direction.
- 18. The line that goes from one side of a circle to the other while passing through the centre.