3-1
• If a fluid flows from a fire hydrant to a fire.
Where is the high pressure located? How do
you know?
5 pts
3-1
• Where is atmospheric pressure least?
– At the ocean
– where an airplane cruises
– In a mountainside city
– at the outer edge of the atmosphere
5 pts
3-2
The buoyant force acting on the duck is
_________________. The weight of the
displaced water is ____________.
35N
30 N
10 pts
3-2
• An object does this when its weight is the
same as its buoyant force.
10 pts
3-1
• Define water pressure
5 pts
3-1
• A camera sitting on your desk has an area of
.73 m2 and weighs 5.5N. What is the pressure
exerted by the camera on your desk?
15 pts
3-2
Will an object with a density of 1.1 g/mL float or
sink in fresh water? Why?
5 pts
3-1
• What is the SI unit for pressure called?
5 pts
3-1
• Fish consume oxygen gas in the water and
expel carbon dioxide out their mouth. This
carbon dioxide comes out in the form of a
bubble. Explain why the bubble is round.
15 pts
3-2
Aluminum has a density of 2.7 g/cm3. If a block
of aluminum is cut in half, what will be the
density of each piece of aluminum? Why?
15 pts
3-1
• Which of the following statements best
describes why rain drops fall to the ground
from a cloud?
– A fluid can flow and take the shape of its’
container.
– Air is about 1,000 times less dense than water.
– Fluids flow from low to high pressure
10 pts
3-2
• The amount of matter in a given volume, or
mass per unit volume.
5 pts
3-2 After a ship wreck, buried treasure
sank to the bottom of the ocean.
Explain why it sank according to
buoyant force.
10 pts
3-1
• Fluids have characteristic properties that allow
you to identify them. List three properties of
fluids.
5 pts
3-2
You are asked to find the identity of an unknown
substance. You are given the objects weight,
mass, density and volume. Which piece of
information would best be used to help you
identify the substance?
10 pts
3-1
• Scientifically, explain why things are sucked
into a tornado.
10 pts
3-2
• Which of the following would affect the level
at which a row boat floats in a body of water?
Give all correct answers:
– depth of the water
– number of people in the canoe
– shape of the canoe
– density of the canoe’s material
10 pts
3-2
• You are given a solid ball of clay. You are
instructed to make the clay float. You must
use all of the clay. What do you do?
5 pts
3-2
• This explains why a rock that displaces 5N of
water has a buoyant force of 5N.
– Pascal’s Principle
– Bernoulli’s Principle
– Newton’s Principle
– Archimedes’ Principle
10 pts
3-2
• What substance is less dense than air? How
do you know?
5 pts
3-2
Emily and her partner are performing a science
lab. They are given the density of 6 different
objects. How do you know which objects will
sink or float in water?
10 pts
3-2
• An object with a weight of 75 N and a buoyant
force of 75N will ______________.
5 pts
3-1
• Explain why your ears pop when you go up in
an air plane. Be specific.
10 pts
3-2
• An object that has a greater weight than its’
buoyant force will__________________.
5 pts
3-1
• Define a fluid
5 pts
3-1
What type(s) of pressure are acting on
the characters in the scene below?
10 pts
3-1
• The amount of force on a given area.
5 pts
3-1
• The upward force that fluids exert on all
matter.
5 pts
3-2
• What is the density of water?
5 pts
3-1
• Explain how water pressure changes as depth
changes.
5 pts
3-2
Calculate the density of an object that has a
mass of 73g and a volume of 24 cm3.
15 pts
3-2
• A carton of ice cream weighs 18N. It displaces
a volume of water that weighs 13N. What is
the buoyant force on the object?
15 pts
3-1
Explain the exchange in pressure that occurs
when you breathe.
15 pts