Across
- 4. Force between two objects that is due to their mass
- 7. A material which does not allow current to flow
- 10. The amount of matter in an object - it is measured in grams or kilograms
- 11. A completely empty space that contains no particles
- 12. A material which allows current to flow
- 13. Unit of electric current
- 15. Subatomic particle which carries negative charge
- 16. The size of the pull of gravity for a given mass
Down
- 1. When something moves back and forwards many times
- 2. When something hits a surface and 'bounces back' towards its source
- 3. To transfer (energy) in a wasteful way
- 5. The substance a sound wave travels through
- 6. A device for measuring current
- 8. Unit of force
- 9. A flow of electric charge
- 14. A reflected sound