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### 56 True/False questions

1. When the weight of a submerged object is greater than the buoyant force, the object will?rise to the surface and float

2. Pressure varies with _____ in ______force, area

3. What is the SI unit of mass density?kilograms per cubic meters

4. Solids and liquids tend to be almost ______, meaning that their density changes very little with changes in pressurevolume

5. Steel is much denser than water. How, then, do steel boats float?Because of the pressure of the water, forces act on the boat. The resulting force is the buoyancy force, which pushes the boat up.

6. What is the continuity equation?areaspeed in region1=area speed in region 2

7. How does the buoyant force that acts on a fish compare with the weight of the fish?same

8. Buoyant forces can keep objects _______the upward force exerted by a liquid on an object immersed in or floating on the liquid

9. Rate of______ = Volume/time
V/t = A1v1 = A2v2
flow

10. If you immerse a tin can with a small hole in it in water so that water spurts through the hole, what will be the direction of water flow where the hole is?The two are equal because the buoyant force depends only upon the density and volume of the liquid that is displaced.

11. What is the Continuity equation?Pascal; Pa

12. the buoyant force will equal ... at any depthafloat

13. What is Bernoulli's Principle?Pressure applied to a fluid in a closed container is transmitted equally to every point of the fluid and to the walls of the container

14. When the weight is less than the buoyant force, the object will?sink

15. Fluida fluid that has no internal friction or viscosity and is incompressible

16. Why does the buoyant force act upward for an object submerged in water?there is a greater pressure against the bottom

17. The continuity equation results from ________ of ______conservation, mass

18. Is a large amount of pressure always caused by a large force? Explain your answer.No. Pressure is force per unit area: p=f/a. Thus it does not require a large force to produce a large pressure.

19. Water pressure increases with _____force, area

20. the apparent weight of an immersed object depends on _______density

21. Applied pressure is transmitted equally throughout a ______density

22. If an inflated beach ball is placed beneath the surface of a pool of water and released it shoots upward, out of the water. use archimedes' principle to explain why...they are equal

23. Pressurethe magnitude of the race on a surface per unit area

24. What are the 3 simple rules when it comes to sinking and floating?1) an object more dense than the fluid in which it is immersed sinks
2) an object less dense than the fluid sinks
3) an object with equal density to the fluid neither sinks nor floats

25. Equation for mass densitythe concentration of the mass of an object, measured in mass per unit volume of a substance

26. What is the relationship between liquid pressure and depth of a liquid? Between liquid pressure and density?liquid pressure increases with depth; it increases with density

27. Will a ship ride higher in an inland freshwater lake or in the ocean? Why?rides higher in salt water. Because the density of the water is higher. Which means that the weight of the displaced water is higher, so the ship needs less displaced water to balance it's weight.

28. Buoyant force acts in the _____ ______ of the force of gravityopposite direction

29. Moving fluids can exhibit ________ (smooth) flow or______ (irregular) flowlaminar, turbulent

30. What is the SI unit of pressure?kilograms per cubic meters

31. Solid objects only exert pressure in one direction.Liquids and gases exert pressure equally in all directions.

32. Pressure=_____/_____the magnitude of the race on a surface per unit area

33. Explain why balloonists use helium instead of air in balloons.Pascal; Pa

34. When drinking through a straw, you reduce
the pressure in your mouth and the atmosphere moves the liquid. Could you use a straw to drink on the moon?
No, a straw will not function on the Moon because there is no atmosphere.

35. Buoyant Forcethe upward force exerted by a liquid on an object immersed in or floating on the liquid

36. the upward force that acts in the opposite direction of gravityopposite direction

37. more internal pressure meansless speed and kinetic energy

38. What is Pascal's Principle?the pressure in a fluid decreases as the fluid's velocity increases

ex.) as air flows around an airplane wing, air above moves faster than air below, producing a lift

39. Astronauts sometimes train underwater to simulate conditions in space. Explain why.because of buoyancy in water your body comes up stimulating weightlessness.... hence astronauts train underwater

40. Liquids have a definitive ______, gases do notvolume

41. Why does the buoyant force on submerged objects not act sideways?there is a greater pressure against the bottom

42. Fluids move from areas of ______ pressure to _____ pressure.Liquids and gases exert pressure equally in all directions.

43. Absolute pressure= ______ pressure+(density*___-___ acceleration)high, low

44. When the weight is equal to the buoyancy force, the submerged object will?rise to the surface and float

45. The speed of fluid depends on cross-sectional ____area

46. An ______ ______ is a fluid that has no internal friction or viscosity and is incompressiblerise to the surface and float

47. How does water pressure 1 meter below the surface of a small pond compare with water pressure 1 meter below the surface of a huge lake?they are equal

48. when water is pushed aside by an objectareaspeed in region1=area speed in region 2

49. Is the weight of the displaced water or the the weight of the submerged object the buoyant force when an object is completely submerged?rise to the surface and float

50. magnitude of buoyant force=_____ of ___ _____depth, fluid

51. Lead has a greater density than iron, and both metals are denser than water. Is the buoyant force on a lead object greater than, less than, or equal to the buoyant force on an iron object of the same volume?Buoyancy Force

52. Mass density is ___ per unit of ____ of a substancemass, volume

53. Mass Densitythe concentration of the mass of an object, measured in mass per unit volume of a substance

54. After a long class, a physics teacher stretches out for a nap on a bed of nails how is this possible?Archimedes principal is: "The upward buoyancy force is equal to the magnitude of the weight of fluid displaced by the body". So, the upwards force on the beach ball is equal to the weight ot the water idisplaced when pushed underwater.

55. A _____ is a material that can flow, and thus it has no definite shape. Both _____ and liquids are fluidsThe two are equal because the buoyant force depends only upon the density and volume of the liquid that is displaced.

56. Ideal Fluida nonskid state of matter in which the atoms or molecules are free to move past each other, as in a gas or a liquid