Across
- 2. an object or surface rubbing against another
- 4. a plane flying from dallas to korea
- 9. always occurs in pairs
- 10. opening and shutting a door
- 11. newton's first law of motion
- 13. 20 newtons (N) to the left
- 14. air bags in cars
- 15. the amount of matter in something
Down
- 1. throwing a ball
- 3. sum of all forces acting on an object
- 5. the weather today is 39 and later it increases to 69
- 6. how fast a car goes
- 7. isaac newton discovered this existence
- 8. mass x velocity
- 12. a car changing direction