Chapter 13
Forces in Fluids Review
1
• What is the standard unit of pressure?
2
• What is the equation to calculate pressure?
3
A dentist’s chair makes use of Pascal’s principle
to move patients up and down. Together, the
chair and a patient exert a downward force of
2269 N. The chair is attached to a large piston
with an area of 1221 cm2. To move the chair, a
pump applies force to a small piston with an
area of 88.12 cm2. What force must be exerted
on the small piston to lift the chair?
4
• What happens to the pressure as the
elevation increases?
5
• What happens to the pressure as the depth in
water decreases?
6
• When pressure is applied to a confined fluid,
the increase in the pressure is transmitted
equally to all parts of the fluid. This is called…
7
• An object under water feels lighter than it
does in air because of…
8
• If an object is dropped into a beaker
containing a liquid and drops to the bottom of
the beaker, what is the relationship between
the buoyant force and the weight of the
object?
9
A factory lift is used to raise a load of 2225 N on
a piston that has an area of 706.8 cm2. How
much pressure does the lift’s engine need to
exert on the hydraulic fluid to lift the required
load?
10
• Air above a wing is moving slower than air
below a wing. What will happen to the wing?
11
• The rising of smoke up a chimney is partly
explained by which principle?
12
• A device that increases force that works
because of Pascal’s principle, such as the
braking system of a car, is called a __________
_______________.
13
• Using the term buoyant force, explain why ice
floats to the surface in water. What must be
the density of ice compared to water?
14
What is the density of a piece of wood that has
a mass of 25.0 grams and a volume of 29.4 cm3?
15
• List 8 fluids.
16
• Explain why a dam on a deep lake needs to be
thicker at the bottom than at the top.
17
• The same force is applied to two different
objects. The area over which the force is
applied to object A is twice as large as the
area over which the force is applied to object
B. Which one will experience the most
pressure?
18
• What is the force exerted on the right piston?
19
• What two things must be known to calculate
the pressure exerted on a surface?
20
• What does Archimedes’ Principle state?
21
A cup of gold colored metal beads was
measured to have a mass of 425 grams. By
water displacement, the volume of the beads
was calculated to be 48.0 cm3. Given the
following densities, identify the metal.
Gold: 19.3 g/mL
Copper: 8.86 g/mL
Bronze: 9.87 g/mL
22
• The supporting force exerted by a fluid on the
wing of a plane is called _________.
23
• State the Principle:
24
• State the Principle:
25
• State the Principle:
26
• State the Principle:
27
• State the Principle:
28
• State the Principle: