Name:    Density - Chapter 5

True/False   --- Indicate whether the statement is true or false.

1.

On Earth, a pound of feathers has the same weight as a pound of lead.

2.

The relationship between the mass and volume of an object is its weight.

3.

The volume of an object is due to the space taken up by atoms of the object.

4.

Matter that has the ability to flow is called a fluid.

5.

When the buoyant force on a ball is less than the weight of the ball, the ball will float.

6.

A block of plastic is dropped into a tub of water. If the buoyant force on the block is greater than the weight of the block, the block will float.

7.

Buoyancy states that less dense objects will float in more dense liquids.

8.

If you weigh 90 kg on earth you would also weigh 90 kg on Jupiter since your mass does not change when you are in a different gravity environment.

9.

A newton is a measurement of mass on other planets that have a different gravitational pull, but we don’t really use it on Earth.

Multiple Choice  -- Identify the choice that best completes the statement.

10.

The space that an object takes up is known as its:
 a. density. b. volume. c. weight. d. mass.

11.

The density of an object equals its:
 a. mass ÷ volume. b. mass ´ volume. c. volume ÷ mass. d. volume + mass.

12.

 Material Density Wood 0.9 g/cm3 Glass 2.3 g/cm3 Aluminum 2.7 g/cm3 Iron 7.8 g/cm3

A block has a mass of 78 grams and a volume of 10 cm3. Using the table above, what material is the block made of?
 a. Wood b. Glass c. Aluminum d. Iron

13.

By adding more aluminum to an aluminum block, you:
 a. increase its density. b. decrease its density. c. decrease its mass. d. do not change its density.

14.

Mass is measured in:
 a. inches and feet. b. pounds and ounces. c. kilograms and grams. d. cubic centimeters.

15.

Which of the following measures the pulling force of gravity on an object?
 a. Volume b. Weight c. Mass d. Distance

16.

What is the volume of this box with dimensions of 5 cm ´ 3 cm ´ 2 cm?
 a. 10 cm b. 10 cm3 c. 30 cm d. 30 cm3

17.

Matter that has the ability to flow is a:
 a. fluid. b. gas. c. liquid. d. All of the above

18.

The lifting force that causes an object to float is known as:
 a. density. b. buoyancy. c. volume. d. fluidity.

19.

Density is typically measured in which SI units?
 a. g/cm b. g/cm2 c. g/cm3 d. g/cm4

Figure 5-1A

20.

If the buoyant force on the ball in Figure 5-1A is greater than the weight of the ball, the ball will:
 a. float. b. sink. c. have neutral buoyancy. d. float and then sink.

21.

If the buoyant force on the ball in Figure 5-1A is less than the weight of the ball, then the ball will:
 a. float. b. sink. c. have neutral buoyancy. d. float then sink.

22.

If the buoyant force on the ball in Figure 5-1A equals the weight of the ball, the ball will:
 a. float. b. sink. c. have neutral buoyancy. d. float then sink.

23.

If an object is less dense than the fluid it is placed in, it will:
 a. sink. b. float. c. drift in the middle of the fluid. d. dissolve in the fluid.

24.

If an object with a density of 2.0 g/cm3 is placed in a fluid with a density of 1.9 g/cm3, the object will:
 a. float. b. sink. c. have neutral buoyancy. d. dissolve in the fluid.

25.

If an object in a tank of water has neutral buoyancy, you can conclude that:
 a. the object is denser than water. c. the object’s density is equal to that of the water. b. the object is less dense than water. d. No conclusion can be made.

26.

If the force of gravity on Jupiter is greater than the force of gravity on Earth, how would your mass on Jupiter compare to your mass on Earth?
 a. It would be greater. c. It would be the same. b. It would be less. d. You can’t tell without the numbers.

27.

If the force of gravity on the moon is less than the force of gravity on Earth, how would your weight on the moon compare to your weight on Earth?
 a. It would be greater. c. It would be the same. b. It would be less. d. You can’t tell without the numbers.

28.

Calculate:  What is the density of a gold ring that has a volume of 1.55 cm3 and a mass of 29.95 g?
 a. 0.5 g/cm3 b. 4.65 g/cm3 c. 19.3 g/cm3 d. 21.7 g/cm3

29.

How does the density of a thin copper wire compare to a copper ring?
 a. It is higher. c. It is the same. b. It is lower d. You can’t tell without the numbers.

30.

In order to change the density of an object, you must:
 a. change its mass. c. change its mass OR volume. b. change its volume. d. change its shape.

31.

When an object’s volume is made smaller and its mass remains the same, its density:
 a. increases. c. remains the same. b. decreases. d. increases then decreases.

32.

High-density objects have:
 a. a large volume for their mass. c. a large volume for their temperature. b. a small volume for their mass. d. a small volume for their temperature.

33.

If a low-density object is placed in a high-density fluid, the object will:
 a. be able to push aside fluid equal to its mass. b. not be able to push aside fluid equal to its mass. c. increase in density. d. decrease in density.

34.

Which of the following is NOT a fluid?
 a. Helium gas b. Maple syrup c. Brick d. Water

35.

Calculate:  A golf ball has a mass of 45.7 g. Its volume is 41 mL. What is its density?
 a. 1.11 g/mL b. 86.7 g/cm3 c. 4.7 g/cm3 d. 1.11 g/cm3

36.

Calculate:  A racketball has a mass of 40.6 g. Its volume is 47.7 cm3. What is its density?
 a. 88.3 g/cm3 b. 1936.62 g/cm3 c. 7.1 g/cm3 d. .85 g/cm3

37.

An apple has a mass of 160.25 grams. Its volume is 163 mL. Does it sink or float in water?
 a. sink c. suspended below the surface b. float d. I have no idea!

38.

A lime has a mass of 88.05 grams. Its volume is 87 mL. Does it sink or float in water?
 a. float c. suspended below the surface b. sink d. I have no idea!

Matching

 a. density d. buoyancy g. displacement j. weight m. g/mL b. mass e. float h. newton k. suspension n. atoms c. volume f. sink i. neutral buoyuancy l. g/cm3 o. density column

39.

The relationship between the mass and volume of an object is called.....

40.

If an object is less dense than the fluid it is placed in, it will .....

41.

______ is created as fluid surrounds an object.

42.

The pulling force of gravity affects the measurement of .....

43.

On Jupiter you would need to measure weight using this unit .....

44.

A scuba diver needs to be able to float suspended in water. This is called ....

45.

Length (x) width (x) height = ?

46.

An object with a density of 1.5 g/mL would ______ in water.

47.

Adding more aluminum to a block of aluminum changes its mass and _____

48.

The density unit of measurement used with a displacement tank is ______

 a. 0.19 g/mL c. 0.79 g/mL e. 1.33 g/cm3 g. 2.79 g/cm3 b. 0.5 g/mL d. 0.9 g/mL f. 8.9 g/cm3

Consider this tank of water with 7 objects. 4 are floating. 3 have sunk to the bottom.
Match the densities listed above to the apparent behavior of the objects.

49.

If object #5 sank the quickest of the three colored objects. What is its density?

50.

Identify the probable density of object #1.

51.

If object #7 was the last one to sink to the bottom, identify its density.

52.

Identify the probable density of object #4.

53.

Identify the probably density of object #2.

54.

Identify the probably density of object #3

55.

Object #6 had the second fastest sink time. What is its density?