Type Topic in here!

1. Type Topic in here!

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 • Friction that causes engine parts to wear out • Friction between car tires and the road that moves the car forward • Friction that wears holes in your socks • 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