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**Review for quiz on Wednesday**

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**1.What is the formula for calculating pressure?**

A.force divided by area B.pressure divided by force C.mass divided by volume

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**2.Which of the following is not an example of a fluid?**

A.hydrogen B.oxygen C.coffee D.water E.clay

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**3.As you climb higher up a mountain, air pressure would:**

A.increase B.decrease C.stay the same

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**4.An increase in the depth of water creates what kind of change in water pressure?**

A.decrease B.increase C.no change

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5.One pascal is equal to: A.1 Newton of force per square mile B.1 Newton of force per square meter C.1 Newton of force per square second D.1 Newton of force per square inch

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**6.Which of the following is Pascal's principle?**

A.Water pressure increases as depth increases. B.Air pressure decreases as elevation increases. C.When force is applied to a confined fluid, an increase in pressure is transmitted equally to all parts of the fluid. D.The buoyant force of an object is equal to the weight of the fluid displaced by an object.

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**7.Which of the following is not an example of a hydraulic system?**

A.Brakes of a car B.Ladder of a fire truck C.Car Jack D.Computer

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**8.What force makes you feel lighter in the water?**

A.centripital force B.force of gravity C.buoyant force D.force pump

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**9.The amount of matter in an object is called:**

A.volume B.area C.mass D.length

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**10.The amount of space an object takes up is called:**

A.volume B.area C.mass D.length

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**11.What is the formula for density?**

A.force divided by area B.pressure divided by force C.mass divided by volume D.volume divided by force

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**12.Which of the following is Archimede's principle?**

A.When force is applied to a confined fluid, an increase in pressure is transmitted equally to all parts of the fluid. B.The buoyant force of an object is equal to the weight of the fluid displaced by an object. C.Water pressure increases as depth increases. D.Air pressure decreases as elevation increases.

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**13.In order for an object to float in a container of water its density must be:**

A.greater than 1 gram per cubic centimeter B.less than 1 gram per cubic centimeter C.equal to 1 gram per cubic centimeter

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**14.In order for an object to sink in a container of water, its density must be:**

A.greater than 1 gram per cubic centimeter B.less than 1 gram per cubic centimeter C.equal to 1 gram per cubic centimeter

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**15.If an object has a mass of 50g and a volume of 10 cubic centimeters, what would be its density?**

A.5 g/cc B.50 g/cc C.10 g/cc D.2 g/cc

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16.If an object has a mass of 4 grams and a volume of 8 cubic centimeters, what would be its density? A.5 g/cc B..5 g/cc C.4 g/cc D.8 g/cc

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**17. If an object has a density of**

17.If an object has a density of .04 g/cc and it is put in a container of water, what would happen to it? (hint:Water has a density of 1 g/cc) A.It would sink B.It would float C.It would neither sink nor float

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18.If an object has a density of 14g/cc and it is put in a container of water, what would happen to it? (hint: Water has a density of 1g/cc) A.It would sink B.It would float C.It would neither sink nor float.

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**19. According to Pascal, pressure applied to a fluid __________.**

A) is transmitted unchanged throughout the fluid B) fluctuates as it is transmitted throughout the fluid C) increases as it moves through the fluid D) decreases as it moves through the fluid

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**20.__________ is the force per unit area applied on the surface of an object.**

A) Pressure B) Weight C) Gravity D) Mass

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**21.What is the approximate pressure exerted on your body by the atmosphere at sea level?**

A) 1,000 Pa B) 100 Pa C) 100,000 Pa D) 10,000 Pa

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**22.What determines whether an object will sink or float?**

A) the direction of the buoyant force on the object B) whether the buoyant force is larger than the object's weight C) whether gravity acts on the object in the fluid D) whether a buoyant force acts on the object

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**23. A(n) __________ uses a fluid to increase an applied force**

23. A(n) __________ uses a fluid to increase an applied force. A) compound machine B) wheel and axle C) hydraulic system D) simple machine

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**24. The same force is applied to two different objects**

24. The same force is applied to two different objects. The area over which the force is applied to object A is twice as large as the area over which the force is applied to object B. Which of the following statements is true of these objects? The pressure applied to object A is equal to the square of the pressure applied to object B. B) If the same force is used, the pressure exerted on the objects is the same. C) The pressure exerted on object B is twice as great as the pressure exerted on object A. D) The pressure exerted on object A is twice as great as the pressure exerted on object B.

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25. What two things must you know to calculate the pressure exerted on a surface? A) the area over which a force is applied and the mass of the object applying the pressure B) the force and the weight of the object C) the force that is applied and the density of the surface D) the force and the area over which it is applied

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**26. Which of the following is NOT a fluid? A) pure oxygen**

B) steam C) water D) ice

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**27. Pressure is defined as __________. A) P1 = P2**

B) pressure = force/area C) pressure = mass/acceleration D) pressure = area/force

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28. Bernoulli's principle states that as the velocity of a fluid __________, the pressure exerted by the fluid __________ A) decreases, decreases B) increases, increases C) decreases, increases D) increases, decreases

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**29. Archimedes' principle states that __________**

29. Archimedes' principle states that __________. A) the buoyant force on an object is greater than the weight of the fluid it displaces B) when the speed of a fluid increases, the pressure exerted by the fluid decreases C) the buoyant force on an object is equal to the weight of the fluid it displaces D) pressure applied to a fluid is transmitted unchanged throughout the fluid

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**30. An object weighing 50 kg is floating in a fluid**

30. An object weighing 50 kg is floating in a fluid. What is the buoyant force of the fluid on the object? A) > 50 kg B) 50 kg C) < 50 kg D) Not enough information is given.

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**31. How does Bernoulli's principle explain how airplanes fly?**

A) The backward force exerted by an engine creates an equal and opposite push, resulting in lift. B) Air pressure is greater on the top of the wings, creating lift. C) The air pressure on top of the wing is equal and opposite to the air pressure on the bottom, creating a balanced upward force. D) Air pressure is greater below the wings, creating lift.

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32. The supporting force exerted by a fluid on an object immersed in it is called __________. A) viscosity B) density C) lift D) buoyant force

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33. If a cube is submerged in water, where on the cube is the pressure exerted by the water the greatest? A) on the bottom B) The pressure is equal on all sides of a cube. C) on the sides D) on the top

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**34. In which direction is pressure by a fluid exerted on an object that is submerged in it?**

A) downward B) upward C) parallel to the vertical surfaces, perpendicular to the horizontal surfaces D) perpendicular to all surfaces of the object

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**35. A __________ is any substance that has no definite shape and can flow.**

A) plasma B) fluid C) gas D) liquid

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Pressure Force per unit area Units: Pa (N/m 2 ), lb/in 2, atm, torr, mmHg P = pressure, N (psi) F=force, N (lb) A= area, m 2 (in 2 )

Pressure Force per unit area Units: Pa (N/m 2 ), lb/in 2, atm, torr, mmHg P = pressure, N (psi) F=force, N (lb) A= area, m 2 (in 2 )

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