Across
- 4. When two forces have the same size, act in opposite direction and act on the same object they are...
- 7. A substance placed between two moving surfaces to reduce the friction between them.
- 9. The maximum distance a particle moves away from its resting position when a wave passes.
- 10. The energy store in a moving object.
- 11. Waves in which the oscillations are parallel to the direction of motion.
- 13. Used to measure forces.
- 17. The principle of the conservation of energy states that energy can never be created or destroyed only ...
- 18. A line drawn at right angles to a block or surface.
- 20. When an object changes speed or direction it ...
- 21. The force due to gravity.
- 23. ... = frequency x wavelength
- 24. Objects with a larger amplitude will sound...
- 25. Thermal ... A number which states how good a material is a transferring energy by heating.
- 26. The total force acting on an object (including a direction!).
Down
- 1. The ... mass is a measure of how hard it is to change the velocity of an object (i.e. accelerate it).
- 2. The energy store in food.
- 3. The change in direction of a wave when it passes from one medium to another.
- 5. A force ... is the area around an object where the effect of its force can be felt.
- 6. A diagram used to show energy transfers. The wider the arrow, the more energy transferred.
- 8. The value of gravitational field strength on earth.
- 9. A pair of forces which have the same size, opposite direction and act on different objects (2 words).
- 12. A force which acts when two objects touch.
- 14. The ratio of useful energy output to total energy input.
- 15. The energy transfer in a liquid or gas. Hot air rises and cold air sinks to take its place.
- 16. The time for one complete wave.
- 19. The energy transfer which allows us to see.
- 22. The unit of frequency.