"Unit 2 - Describing Motion": HTML5 Crossword

Across

2. Support force that is at right angle to the surface (6)
6. The property of things to resist a change in motion (7)
8. an object's change in position relative to a reference point (6)
9. measures the total path taken (8)
10. Force of friction in the air (3,10)
11. a system for specifying the precise location of objects in space and time (5,2,9)
16. Units for speed (6,3,6)
17. Push or Pull on an object (5)
18. Measure of mass per unit of volume for a substance (7)

Down

1. The quantity of matter in an object (4)
2. Standard unit of force in the SI (6)
3. the net change of an object's position (12)
4. The rate of change in velocity over time (12)
5. The unit of measure of mass (9)
7. The vector sum of all forces acting on a non-accelerating object equals zero (11,4)
12. Motion under the influence of gravitational pull only (4,4)
13. Type of friction that occurs when the object is moving or in motion. (7)
14. Force that opposes motion (8)
15. The total of all forces acting on the object (3,5)
16. Units for distance (6)