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### 56 Matching questions

1. The speed of fluid depends on cross-sectional ____
2. What is the relationship between liquid pressure and depth of a liquid? Between liquid pressure and density?
3. when water is pushed aside by an object
4. What is Pascal's Principle?
5. Pressure
6. the apparent weight of an immersed object depends on _______
7. Pressure varies with _____ in ______
8. 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?
9. Mass density is ___ per unit of ____ of a substance
10. What is the SI unit of pressure?
11. Solids and liquids tend to be almost ______, meaning that their density changes very little with changes in pressure
12. Buoyant Force
13. magnitude of buoyant force=_____ of ___ _____
14. more internal pressure means
15. Liquids have a definitive ______, gases do not
16. 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?
17. Explain why balloonists use helium instead of air in balloons.
18. Mass Density
19. Absolute pressure= ______ pressure+(density*___-___ acceleration)
20. What is Bernoulli's Principle?
21. Buoyant forces can keep objects _______
22. Will a ship ride higher in an inland freshwater lake or in the ocean? Why?
23. Why does the buoyant force act upward for an object submerged in water?
24. What are the 3 simple rules when it comes to sinking and floating?
25. What is the SI unit of mass density?
26. What is the Continuity equation?
27. Moving fluids can exhibit ________ (smooth) flow or______ (irregular) flow
28. A _____ is a material that can flow, and thus it has no definite shape. Both _____ and liquids are fluids
29. After a long class, a physics teacher stretches out for a nap on a bed of nails how is this possible?
30. Steel is much denser than water. How, then, do steel boats float?
31. Fluids move from areas of ______ pressure to _____ pressure.
32. Water pressure increases with _____
33. 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?
34. Astronauts sometimes train underwater to simulate conditions in space. Explain why.
35. Ideal Fluid
36. Solid objects only exert pressure in one direction.
37. Rate of______ = Volume/time
V/t = A1v1 = A2v2
38. Is the weight of the displaced water or the the weight of the submerged object the buoyant force when an object is completely submerged?
39. Pressure=_____/_____
40. When the weight is less than the buoyant force, the object will?
41. 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...
42. Equation for mass density
43. Applied pressure is transmitted equally throughout a ______
44. the buoyant force will equal ... at any depth
45. Is a large amount of pressure always caused by a large force? Explain your answer.
46. When the weight of a submerged object is greater than the buoyant force, the object will?
47. An ______ ______ is a fluid that has no internal friction or viscosity and is incompressible
48. Fluid
49. 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?
50. When the weight is equal to the buoyancy force, the submerged object will?
51. Buoyant force acts in the _____ ______ of the force of gravity
52. The continuity equation results from ________ of ______
53. What is the continuity equation?
54. How does the buoyant force that acts on a fish compare with the weight of the fish?
55. Why does the buoyant force on submerged objects not act sideways?
56. the upward force that acts in the opposite direction of gravity
1. a opposite direction
2. b area
3. c rise to the surface and float
4. d Liquids and gases exert pressure equally in all directions.
5. e areaspeed in region1=area speed in region 2
6. f 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
7. g sink
8. h density
9. i remains at any level
10. j laminar, turbulent
11. k No. Pressure is force per unit area: p=f/a. Thus it does not require a large force to produce a large pressure.
12. l 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.
13. m same
14. n high, low
15. o The two are equal because the buoyant force depends only upon the density and volume of the liquid that is displaced.
16. p conservation, mass
17. q A1v1 = A2v2
18. r kilograms per cubic meters
19. s The weight of the teacher would be spread out across the nails rather than all centered on one, preventing the nails going through the body of the teacher.
20. t the upward force exerted by a liquid on an object immersed in or floating on the liquid
21. u there is a greater pressure against the bottom
22. v ideal fluid
23. w mass, volume
24. x perpendicular to the surface of the can
25. y 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.
26. z flow
27. aa 10 N
28. ab displaced
29. ac a fluid that has no internal friction or viscosity and is incompressible
31. ae depth
32. af Buoyancy Force
33. ag force, area
34. ah mass density=mass/volume
35. ai atmospheric, free
36. aj fluid, gases
37. ak weight, fluid, displaced
38. al the weight of the displaced water
39. am fluid
40. an the concentration of the mass of an object, measured in mass per unit volume of a substance
41. ao Pascal; Pa
42. ap volume
43. aq the magnitude of the race on a surface per unit area
44. ar Because of the pressure of the water, forces act on the boat. The resulting force is the buoyancy force, which pushes the boat up.
45. as a nonskid state of matter in which the atoms or molecules are free to move past each other, as in a gas or a liquid
46. at they are equal
47. au 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
48. av pressure of each side is the same
49. aw Since pure Oxygen is heavier than air, a balloon filled with Oxygen would sink because of its heavier contents plus the weight of the balloon
50. ax depth, fluid
51. ay less speed and kinetic energy
52. az liquid pressure increases with depth; it increases with density
53. ba because of buoyancy in water your body comes up stimulating weightlessness.... hence astronauts train underwater
54. bb 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
55. bc afloat
56. bd No, a straw will not function on the Moon because there is no atmosphere.