1. Chapter 9 Forces and Motion

2. If you add force to an open door it _________________.

3. Moves

4. The _____________ of an object is its position.

5. Location

6. When an object rubs against another object it creates _______________.

7. Friction

8. When an object changes __________ it is in motion.

9. Position

10. The pull of ________ on an object is that object’s weight.

11. Gravity

12. Scientists measure _________ in newtons.

13. Weight

14. The __________ between two places is called distance.

15. Length

16. A __________ measures weight in the English system.

17. Pound

18. A cheetah can run at a greater __________ than a person can.

19. Speed

20. Things fall to Earth because of ______________.

21. Gravity

22. It would be hard to skate on a gravel road because the gravel increases ___________.

23. Friction

24. To measure speed you need to measure _______ and _______.

25. Time and Distance

26. The force of _________ can slow things down.

27. Friction

28. If you can run 6 miles in an hour how far can you run in one and one half hours?

29. 9 miles

30. On what planet would you weigh the least?

31. Pluto