Chapte 3 Forces Of Fluids

Front 1

Why doesn't ice float in the air

Back 1

ice is more dense then air

Front 2

the shape of an airplane's wing helps it gain

Back 2

lift

Front 3

an object weighs 15 N. it displaces a volume of water that weighs 20 N. what is the buoyant force of the object?

Back 3

20 N

Front 4

an object weighs 15 N. It displaces a volume of water that weighs 20 N. This object will:

Back 4

sink

Front 5

What is the pressure exerted by a 6000 N crate that has an area of 2m2

Back 5

8000 N

Front 6

A 600 g fish displaces 200 mL of water. What is the density of the fish?

Back 6

3 g/mL

Front 7

Which of the following statements is true:
a. Fluids rarely take the shape of the container
b. fluids include liquid and gases
c. fluids flow from low pressure to high pressure
d. fluids exert the most pressure in the downward direction

Back 7

B

Front 8

Air rushes into your lungs when you inhale because:

Back 8

Fluids include liquids and gases

Front 9

The higher the altitude

Back 9

the lower the air pressure

Front 10

Fluid pressure is exerted evenly in all directions, which explains why

Back 10

bubbles are round

Front 11

which of the statements best explains why air bubbles ride to the surface of a pond:
a. a fluid can flow and take the shape of its container
b. Air is about 1000 times less dense than air
c. pressure is the amount of force exerted on a given area
d. the weight of the asmosphere pushes down on the water

Back 11

B

Front 12

What is affected by an airplane's sped?

Back 12

lift

Front 13

Which would NOT affect the level at which a canoe floats in a body of water:
a. depth of water
b. number of people on the canoe
c. density of the canoes material
d. shape of the canoe

Back 13

A

Front 14

The trust of an airplane comes from

Back 14

engines

Front 15

in salt water an iceberg floats 10% above water and 90% below water

Back 15

in fresh water it would float LOWER because fresh water is LESS dense than salt water

Front 16

One of the reasons smoke foes up in the fireplace is:

Back 16

according to Bernoulli's principle, the wind above the chimney is moving faster

Front 17

Pennies make AFTER 1982 have a higher mass (same Volume) than pennies make before 1982. The buoyant force on a post 1982 penny (WHEN DROPPED IN WATER) is:

Back 17

The SAME as the buoyant force on a pre 1982 penny

BECAUSE IT HAS THE SAME VOLUME

Front 18

A metal bar has a density of 4.8 g/mL. I cut it into 4 equal pieces. Each piece has a density of 1.2 g/ML

Back 18

False

Front 19

The main reason airplanes are pressurized is because there is less oxygen at higher altitudes and you a you would not be able to breathe enough oxygen to survive if they weren't pressurized.

Back 19

True

Front 20

Airplanes fly primarily because of Newton's 3rd law (Coanda EffecT), not Bernoulli's principle

Back 20

True

Front 21

A steel ship ship carrying a large load without sinking illustrates Archimedes' principle. The ship displaces enough water so that its buoyant force is greater than the ship an its heavy load

Back 21

True

Front 22

Car breaks work because of Pascal's principle. When you step on the brake pedal. That fluid pressure is then transferred to the break pads which clamp the wheels and stop the car.

Back 22

True

Front 23

Fluids Always flow from areas of high pressure of areas of low pressure

Back 23

True

Front 24

By filling its swim bladder with gas, a fish increases its volume. That increases its buoyant force causing the fish to rise

Back 24

True

Front 25

The Buoyant force on a submerged object is always in the upward direction

Back 25

True

Front 26

An adult has a greater buoyant force than a child does because of the adult's greater volume

Back 26

True

Front 27

Most people float. Thats because the weight of the water we displace is greater than our own weight

Back 27

True

Front 28

Ive caught a bucker full of fish. to make it easier to carry the bucket to shore, I should fully remove it from the water because the buoyant force on it is less than the bucket's weight.

Back 28

False

Front 29

Race cars are designed to be very aerodynamic so that there is less drag to slow them down

Back 29

True

Front 30

Turbulence can cause an airplane to quickly fall during flight. Lift causes it to rise.

Back 30

True