1. Forces and Motion

2. Team １ Team ２ Forces Motion Speed Velocity Acceleration Velocity

3. A force is a ________ or a ________. A force is a ________ or a ________.

4. A force is a ________ or a ________. A force is a ________ or a ________. Answer: A push or a pull.

5. Balanced forces produce a net force of _________.

6. Answer: zero

7. Rolling friction is usually A. less than B. more than C. equal to sliding friction.

8. Answer: Less than

9. Unbalanced forces are necessary to cause a change in __________.

10. Answer: motion

11. You can run 100 meters in 10 seconds. What is your speed?

12. Answer: 10 m/s

13. An example of acceleration is: A. a hovering helicopter B. a car turning a corner C. bicycling at 40 m/s

14. Answer: A car turning a corner

15. _________ friction includes both liquids and gases.

16. Answer: Fluid

17. A student riding her bicycle on a straight, flat road covers one block every 7 seconds. If each block is 100 m long, she is traveling at _________ speed or velocity.

18. Answer: constant

19. A force is expressed in ___________.

20. Answer: Newtons

21. If a bus traveling 15 m/s south speeds up to 20 m/s, this is a change in __________.

22. Answer: speed or velocity or acceleration

23. Acceleration is the rate of change in ____________.

24. Answer: velocity (also accept speed or direction)

25. The distance divided by the time it took to travel that distance is an object’s _________.

26. Answer: speed

27. When you combine all forces acting on an object you get the ____________.

28. Answer: net force

29. _________ is a force that opposes motion.

30. Answer: Friction

31. What is the net force when you combine a force of 7 N north with a force of 2 N south?

32. Answer: 5N north

33. Moving blades of a windmill or a pinwheel are example of ___________ acceleration.

34. Answer: centripetal

35. Decreasing velocity can be referred to as: A. acceleration B. deceleration C. negative acceleration D. All of the above.

36. Answer: D. all of the above

37. Are the forces on a kicked soccer ball balanced or unbalanced? How do you know?

38. Answer: Unbalanced because the ball changes speed and/or direction.