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### 69 True/False questions

1. Pascal's PrincipleThe buoyant force on an object equals the weight of water displaced by the object.

2. force________ scales display the normal force; they are they are the same when a=0.

3. buoyant forcetouching

4. independentthe tendency of an object to continue in its original motion (or resist change in motion)

5. greaterstatic friction (fs) is ___________ than kinetic friction(fk)

6. massthe tension on a rope is the __________ at all points on the rope.

7. static equilibriumconstant velocity; a=0

8. surface imperfections and intermolecular forcesfriction is caused by......

9. hydraulicsPressure is transferred through a fluid.
An applied small Force on a small Area transmits a big Force on a big Area.
Ex: car brakes, car lift

10. force pumpmoves fluid by changing the pressure in the fluid

11. classical mechanicsmass is ____________; weight depends upon the ___________.

12. equilibriumMeans ΣF = 0
there is no acceleration.
(there must be no net torque too)

13. typesthe tension on a rope is the __________ at all points on the rope.

14. hydrostaticsnon-moving fluids (ex. pressure, floating)

15. Newton's Third Law of MotionF=ma
If a constant force is applied to an object,
it will ACCELERATE

16. buoyant force and the weightWhether an object sinks or floats depends on the .........

17. Archimedes PrincipalWhen you apply a force to a confined fluid (a closed system), that pressure is applied equally to all parts of the fluid

18. scalarinertia is a ___________ quantity

19. conculsions of the force table demo1.Balancing forces involves vector addition.
2.The sum of the forces involves considering x- and y-direction forces.
3.Objects in equilibrium have their forces balanced in both x- and y- directions.

20. downward, downwardobjects accelerating ___________ seem lighter.

21. weak nuclear forcethe sum of all forces on an object

22. upwardobjects accelerating ___________ seem lighter.

23. same__________ is a measure of inertia

24. normal forceforce of surface on object
1.Perpendicular to surface
2. Acts opposite to gravity

25. constanta human's terminal velocity is about 150 mph; an ant's is so low that it can fall far and not get hurt.

26. terminal velocityconstant speed

27. static frictionacts when the object is in motion; f is constant while in motion

28. frictionresistance to motion

29. floats________ scales display the normal force; they are they are the same when a=0.

30. vectorforce is a __________ quantity.

31. fun facta human's terminal velocity is about 150 mph; an ant's is so low that it can fall far and not get hurt.

32. 1. Strong nuclear force
2. Electromagnetic force
3. Weak nuclear force
4. Gravity
What are the four fundamental forces of nature (field)?

33. pressure and depththe force exerted by a fluid depends on the height of fluid above it; the deeper the object, the more pressure.

34. fluida gas or liquid (both flow)

35. universal; locationmass is ____________; weight depends upon the ___________.

36. Weight down and Drag/Air Resistance upfalling objects have 2 forces on them: What are they?

37. tensionforce on a rope

38. upwardobjects accelerating _________ seem heavier.

39. Assumptions with Newton's LawsObjects behave as particles
Masses of strings are negligible
Interested only in the forces acting on the object
(neglect reaction forces)

40. newtonsIf ΣF (net force) = 0, then there is
_______ ACCELERATION.

41. strong nuclear forcevery short range and very weak; responsible for radioactive decay.

42. W=mgweight equation

43. sinksIf an object's weight > buoyant force, then it ________.

44. field forcegravity, charges, magnets

45. inclined planesthe sum of all forces on an object

46. free body diagrama drawing showing all forces on an object

47. contact forcetouching

48. pressurea force pushing against a specific area of a surface. (force/area)

49. net forcethe sum of all forces on an object

50. 1.surface material
2. normal force of each surface on the other
friction is caused by......

51. 1st law implicationsacts to keep the object from moving; if Fa increases, so does ƒs

52. kgWhen the upward Fair resistance = the downward Fgravity, the Fnet = ____.

53. electromagnetic forcelong-ranged but weak; attractive or repulsive force between objects carrying electrical charge.

54. downwardIf the object is less dense than the fluid,
the object experiences a net _____________ force

55. atmospheric pressurecaused by 100 km of air above us

56. 0When the upward Fair resistance = the downward Fgravity, the Fnet = ____.

57. floorIf an object's weight < buoyant force, then it _______.

58. inertiathe tendency of an object to continue in its original motion (or resist change in motion)

59. NOSI units for inertia are _____

60. gravitystatic friction (fs) is ___________ than kinetic friction(fk)

61. weightweight equation

62. geometryan object's terminal velocity depends on the object's _____________.

63. dynamic equilibriumconstant velocity; a=0

64. kinetic frictionacts when the object is in motion; f is constant while in motion

65. apparent weightThe µs and µk are _____________ of the area of contact

66. force of friction (f)acts when the object is in motion; f is constant while in motion

67. Newton's Second Law of Motion1. Every action has an equal and opposite reaction
2. Forces always occur in pairs
3. Action and reaction forces must occur on 2 separate objects
4. Equal in magnitude but opposite in direction

68. Newton's First Law of Motion: Law of Inertia1. Every action has an equal and opposite reaction
2. Forces always occur in pairs
3. Action and reaction forces must occur on 2 separate objects
4. Equal in magnitude but opposite in direction

69. floating objecta human's terminal velocity is about 150 mph; an ant's is so low that it can fall far and not get hurt.