Chapter 6

Question 1

Anything that flows. This refers to gases such as air and liquids such as water.

Answer 1

Fluid

Question 2

The total force on an object divided by the area over which the force is applied.

Answer 2

Pressure

Question 3

A force pushing upward on objects immersed in a fluid.

Answer 3

Bouyant force

Question 4

An object’s mass divided by its volume.

Answer 4

Density

Question 5

The process by which energy is moved from one place to another by being stored in matter as internal energy, then moving the matter from one place to another.

Answer 5

Convection

Question 6

Air is considered a fluid.

Answer 6

true

Question 7

If an object is floating, the buoyant force on it is larger than its weight.

Answer 7

true

Question 8

Frictional forces increase when an object moves faster through a fluid.

Answer 8

true

Question 9

A man standing in a swimming pool weights less because water partially shields him from the full force of gravity.

Answer 9

false

Question 10

Objects that float in air, such as helium balloons, are weightless.

Answer 10

false

Question 11

If you apply a specific force over a larger area, the pressure decreases.

Answer 11

true

Question 12

The force on an object divided by the area over which the force is applied.

Answer 12

Pressure

Question 13

Circulation in a fluid caused by temperature and density differences.

Answer 13

Convection

Question 14

Fluids pulled toward Earth and held in place by the force of gravity.

Answer 14

Unbounded fluids

Question 15

Equals the weight of the displaced fluid.

Answer 15

Buoyant force

Question 16

Anything that Flows

Answer 16

Fluid

Question 17

Type of fluid where pressure acts with equal force on all areas of the confining walls.

Answer 17

Bounded fluids

Question 18

If a block of wood floats with half its volume submerged,

Answer 18

the weight of the block is the same as that of the displaced water.

Question 19

The buoyant force on an object submerged in a fluid can be changed by

Answer 19

Two of the above answers are correct.

Question 20

In convection currents hot air rises and cool air descends.

Answer 20

The warmer air has a lower weight per unit volume than the cooler air which it displaces.

Question 21

The base of a dam is reinforced in case the pressure increases in the future. Which of the following would cause such an increase?

Answer 21

A change of climatic patterns that would increase the lake’s depth over the next several years.

Question 22

Which exerts the largest amount of force on the ground?

Answer 22

An identical swimming pool full to the exact same level with a 50-lb block sitting on the bottom.