2. ForcesFriction Weight vs mass Forces & friction again Hodge podge 10 20 30 40 50

3. Question 1 - 10 Which is an example of a balanced force? A. a baby pushed in a stroller on the sidewalk B. a child running down a path C. A car traveling on the highway D. a porch swing hanging from the roof

4. Answer 1 – 10 D. a porch swing hanging from the roof

5. Question 1 - 20 When the net forces equal 0 N, they are considered ___________ forces

6. Answer 1 – 20 Balanced

7. Question 1 - 30 Which of the following always cause a change in speed, direction, or both? A. balanced forces B. Unbalanced forces C. Neither D. Any combination of forces

8. Answer 1 – 30 B. Unbalanced forces

9. Question 1 - 40 Two forces act on an object. One force has a magnitude of 10 N and is directed toward the north. The other has a magnitude of 5N directed toward the south. The object experiences a net force of A. 5 N south B. 15N north C. 50N North D. 5N North

10. Answer 1 – 40 D. 5N North

11. Question 1 - 50 To produce a change in motion a force must be a(n) A. balanced force B. unbalanced force C. frictional force D. gravitational force

12. Answer 1 – 50 B. unbalanced force

13. Question 2 - 10 Define friction

14. Answer 2 – 10 The force that opposes motion between two surfaces that are touching.

15. Question 2 - 20 When I roll a cart across the floor, the force that opposes the motion is called _______________ friction

16. Answer 2 – 20 Kinetic

17. Question 2 - 30 If I push on a car and the car doesn’t move, this is an example of ___________ friction.

18. Answer 2 – 30 static

19. Question 2 - 40 Which is an example of friction that is helpful a)Friction that causes engine parts to wear out b)Friction between car tires and the road that moves the car forward c)Friction that wears holes in your socks d)Wind causing soil erosion

20. Answer 2 – 40 B. Friction between car tires and the road that moves the car forward

21. Question 2 - 50 Which of the following is a helpful decrease in friction? A. Force applied while scrubbing B. oil added to a car engine C. sand applied to an icy road surface D. deep tread added to snow tires

22. Answer 2 – 50 B. oil added to a car engine

23. Question 3 - 10 Your mass on the moon would

24. Answer 3 – 10 Be the same

25. Question 3 - 20 If a book falls of a desk, what is the attraction? a) the book is attracted to the earth B) the earth is attracted to the book because of mass C) both are attracted to each other

26. Answer 3 – 20 C) both are attracted to each other

27. Question 3 - 30 Do all objects have gravitational force? Explain why or why not

28. Answer 3 – 30 Yes but due to the objects’ masses, one may have less gravitational pull than the other.

29. Question 3 - 40 Does your weight change from place to place (explain why or why not)

30. Answer 3 – 40 Yes due to the mass of the objects (like the moon vs the earth) and how far you are from the center of the earth

31. Question 3 - 50 Name the two factors that effect gravitational pull.

32. Answer 3 – 50 Distance from the object and the masses of the objects

33. Question 4 - 10 Which of these is opposed by kinetic friction A. a book sitting on a table B. a cat standing in a yard C. a box sliding on a floor D. a child leaning on a building

34. Answer 4 – 10 C. a box sliding on a floor

35. Question 4 - 20 Which of these is opposed by static friction? A. A toy car rolling on the floor B. soil erosion C. A working pushing on a box that is too heavy to move D. A dog running in the yard

36. Answer 4 – 20 C. A working pushing on a box that is too heavy to move

37. Question 4 - 30 The gravitational pull is greater between two objects that have A. greater masses B. have rougher surfaces C. are farther apart D. are moving at a greater speed

38. Answer 4 – 30 A. greater masses

39. Question 4 - 40 When a mover puts furniture on a dolly with wheels, which type of friction is the mover using to make his job easier? A. Static B. Sliding kinetic friction C. Rolling Kinetic Friction D. gravitational Friction

40. Answer 4 – 40 C. Rolling Kinetic Friction

41. Question 4 - 50 The force of Gravity A. is not related to the amount of mass of the objects B. is related to the amount of mass of the objects unless the mass is too small C. is related to the amount of mass of the objects but only indirectly D. is directly related to the amount of mass of the objects.

42. Answer 4 – 50 D. is directly related to the amount of mass of the objects.

43. Question 5 - 10 As the distance between 2 objects increases, the force of gravity between them A. decreases B. doesn’t change Increases slightly Increases greatly

44. Answer 5 – 10 A. decreases

45. Question 5 - 20 Which of the following are two factors that determine speed? A. acceleration and time B. Velocity and time C. distance and time D. motion and time

46. Answer 5 – 20 C. distance and time

47. Question 5 - 30 A driver of an SUV drives past a jogger on the subdivision walking path. Relative to the jogger, the SUV is moving 15m/s. What is the reference point in this situation? A. the SUV B. the jogger C. the path on which the jogger is jogging D. The road on which the the SUV is traveling

48. Answer 5 – 30 C. the path on which the jogger is jogging

49. Question 5 - 40 Which of the following most closely illustrates motion by relating it to a reference point ? A. the hands of a clock relative to the numbers on a clock B. the distance a race care traveled relative to the time of travel. C. the speed of a bike relative to the direction of travel D. the velocity change of a train relative to time

50. Answer 5 – 40 A. the hands of a clock relative to the numbers on a clock

51. Question 5 - 50 In which of the following is a skater not accelerating A. going straight while speeding up B. going straight at a constant speed C. making circles in a constant speed D. going straight while slowing down

52. Answer 5 – 50 B. going straight at a constant speed