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Chapter 4

Chapter 4. Review. Question 1. What are the units of Force?. Answer. Newtons (N). Question 2. What are forces that result from physical contact between two objects called?. Answer. Contact. Question 3. A magnet lifting paper clips on a tabletop is an example of a _________ force.

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Chapter 4

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  1. Chapter 4 Review

  2. Question 1 • What are the units of Force?

  3. Answer • Newtons (N)

  4. Question 2 • What are forces that result from physical contact between two objects called?

  5. Answer • Contact

  6. Question 3 • A magnet lifting paper clips on a tabletop is an example of a _________ force.

  7. Answer • Field

  8. Question 4 • Draw a FBD of the sled in the picture below.

  9. Answer • See board

  10. Question 5 • An object at rest remains at rest and an object in motion remains in motion unless acted upon by a net external force is what property of an object?

  11. Answer • Inertia

  12. Question 6 • A car crashes into a telephone pole. Draw a FBD of the car.

  13. Answer • See board

  14. Question 7 • True or False: Inertia is a force

  15. Answer • False

  16. Question 8 • Which object has more inertia, a tennis ball or a bowling ball?

  17. Answer • Bowling Ball

  18. Question 9 • The more ________ an object has, the harder it is to put it in motion or to stop its motion.

  19. Answer • Mass

  20. Question 10 • The wind exerts a force of 452 N north on a sailboat, while the water exerts a force of 325 N west on the sailboat. Find the magnitude and direction of the net force on the sailboat.

  21. Answer • 557 N at 36 West of North

  22. Question 11 • How would you symbolically write “the net force in the x direction is equal to”?

  23. Answer • Fx =

  24. Question 12 • Find the net force acting on the following object 216 N 48 184 N

  25. Answer • Fnet = 165.3 N at 13.8 West of North

  26. Question 13 • Name two possibilities for the velocity of an object that is in a state of equilibrium.

  27. Answer • Constant velocity • Velocity = 0 (at rest)

  28. Question 14 • What is the acceleration of an object that is in a state of equilibrium?

  29. Answer • Acceleration = 0

  30. Question 15 • Find the force (magnitude and direction) that would put the object in a state of equilibrium. 16 N 43 N

  31. Answer • F = 46 N at 20.4 South of West

  32. Question 16 • True of False: A car driving on a straight highway with its cruise control set to 65 mph is in a state of equilibrium.

  33. Answer • True

  34. Question 17 • What is Newton’s Second Law in equation form?

  35. Answer • F = ma

  36. Question 18 • If the mass of an object is decreased, what happens to its acceleration (force is constant)?

  37. Answer • Acceleration increases

  38. Question 19 • A 2 kg otter starts from rest at the top of a muddy incline 0.85 m long and slides down to the bottom in 0.50 s. What net force acts on the otter along the incline?

  39. Answer • F = 13.6 N

  40. Question 20 • Find the acceleration of an 12 kg object subjected to the following forces. 15 N 58 22 10 N

  41. Answer • Acceleration is 0.83 m/s2 at 27.6 North of East

  42. Question 21 • What force would cause the following object to have an acceleration of 5 m/s2 to the West? 6 N F 14 N 22 N m = 2 kg

  43. Answer • F = 40 N

  44. Question 22 • What 2 factors affect the amount of friction that exists between two objects in contact?

  45. Answer • Normal Force • Contact surfaces

  46. Question 23 • If an object is moving, _________ friction opposes the motion.

  47. Answer • Kinetic

  48. Question 24 • Draw a FBD for the following situation. Assume the box is sliding downward towards the level ground.

  49. Answer • See board

  50. Question 25 • What is the formula used to determine the frictional force?

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