Section: Fluids and Pressure

Name______Class______Date______

Skills Worksheet

Directed Reading B

Section: Fluids and Pressure

1.Any material that can flow and takes the shape of its container is called

a(n) ______.

2.Name two states of matter that are fluids.

______

3.What can particles in a fluid do?

______

Fluids and pressure

4.What happens when you pump up a bicycle tire?

______

5.The amount of force exerted per unit area of a surface is

called ______.

6.Force divided by area equals ______.

7.The SI unit of pressure is the ______.

8.The force of one newton exerted over an area of one square meter

is one ______.

9.Why are gas bubbles round?

______

Directed Reading B continued

Atmospheric pressure

Match the correct description with the correct term. Write the letter in the space provided.

_____ 10. pressure caused by the weight of the
atmosphere

_____ 11. percentage of gases found within 10 km of Earth’s surface

_____ 12. force that holds the atmosphere in place

_____ 13. number of newtons pressing on every square

centimeter of your body

14.As you travel “deeper” into the atmosphere, how is atmospheric pressure affected?

______

Number each location listed from 1 to 5 in order of lowest to highest pressure.

_____ 15. top of Mount Everest

_____ 16. La Paz, Bolivia

_____ 17. airplane at 12,000 m

_____ 18. beach at sea level

_____ 19. space shuttle at 150,000 m above sea level

20.Why do your ears “pop” when you take off in an airplane?

______

Water pressure

_____ 21. Water pressure increases as

a.gravity decreases.

b.air pressure decreases.

c.depth increases.

d.particles collide.

Directed Reading B continued

_____ 22. Water pressure and atmospheric pressure affect total pressure on objects that are

a.underground.

b.above sea level.

c.in a car.

d.underwater.

_____ 23. Water pressure does NOT depend on

a.atmospheric pressure.

b.the amount of fluid present.

c.air pockets.

d.gravity.

_____ 24. Water is about 1,000 times more dense than

a.air.

b.pressure.

c.gravity.

d.oil.

25.The amount of matter in a given volume, or mass per unit volume,

is called ______.

26.Why does water exert more pressure than air?

______

27.The pressure at 500 m below the surface is

about ______kPa.

28.The pressure at 8,000 m below the surface is about

______kPa.

pressure differences and fluid flow

29.Describe the pressure changes as you sip a drink through a straw.

______

30.What happens when pressure is lower inside the lungs than outside the lungs?

______

Directed Reading B continued

31.How do pressure differences affect the direction in which fluids flow?

______

32.How do pressure differences explain the destructive effects of a tornado’s winds?

______