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?
______
1