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Across
6. Distance up (or down) divided by distance across on a graph (5)
7. The sum of all values divided by the number of values (7) 9. Force due to a jet, rocket or motor (6) 13. Rate of changing velocity (direction or speed) (12) 16. A rubbing force that acts in a direction opposite to an object's motion (8) 17. When the forces acting on an object are equal in size but opposite in direction (8) 19. Swirly flow in a fluid (10) 20. A force of tension between two objects (4) 21. A force of compression between two objects (4)
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Down
1. Contact between a moving and another moving or stationary object (9)
2. A type of engine that works by producing a stream of fast flowing fluid (3) 3. Shaped to minimise drag forces (11) 4. Unit of distance (5) 5. Slope of a graph (8) 8. Speed in a given direction (8) 10. Rate of movement - distance travelled divided by time taken (5) 11. Friction force due to motion through a gas or liquid (4) 12. At a particular moment in time (13) 14. How far it is between two points (8) 15. Something that causes a mass to change speed or direction (5) 18. Data represented by a picture (5) 19. The fourth dimension, measured in seconds (4)
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