# Glendale Community College Physics in Your Life Worksheet

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Glendale Community College

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SINGLE AREA OF INTEREST: BUOYANCY
i.
Buoyancy is the tendency of a body to float or rise when submerged in a fluid. This
helps to test the buoyancy of the object.
ii.
The density of the water affects the floating or sinking of an object.
iii.
For example, an experiment shows that rise in water density causes the hull of the
boat to sink deeper in water to an observable degree as the temperature is
increased.
iv.
There are three types of buoyancy; negative, positive, and neutral
II.
IDEA OR METHOD #1: BUOYANCY AND FORCE AND MOTION (Design of submarines
and ship)
i.
Chapter Containing Idea or Method
• The chapter where force and motion is discussed in the book is Part I from
page 4 to 244.
ii.
Physics of Idea or Method
• The principle that is used to build submarines and ships is the Archimedes
principle or the principle of floatation.
• The Archimedes principle states that “when an object is partially or fully
immersed in a fluid, it will experience an upward force that is equivalent to
the weight of the fluid displaced by it.
iii.
Relationship to Your Single Area of Interest
• Buoyant force is the power of a fluid to exert an upward force on a body
that is placed in it.
• If the buoyant force exceeds the weight of the object, the object will float to
the surface.
• On the other hand, if the buoyant force is less that the weight of the object,
then it means that the object will sink.
iv.
Example Physics Problem Using Idea or Method in Your Area of Interest
• An example of physics problem using the idea is the design used to make
submarines and ship
v.
Solution and Explanation of Your Example Physics Problem
• When building a ship or a submarine, the weight of the water displaced
must be equal to the weight of the ship.
• Submarines will experience buoyant force, which is equal to the displaced
water.
III.
IDEA OR METHOD #2: BUOYANCY AND PROPERTIES OF MATTER (Hot air Balloon)
i.
Chapter Containing Idea or Method
• The chapter where properties of matter is discussed in the book is Part III
from page 396 to 441.
ii.
Physics of Idea or Method
• Liquids are complicated compared to solids and gases.
• Liquids cannot be compressed, which means that liquid molecules are close
together.
• Additionally, liquids are known to flow and deform to fit the shape of the
container.
iii.
Relationship to Your Single Area of Interest
• The problem described is in line with the law of floatation.
• Density is critical in explaining this concept. The law of floatation states that
“When a body floats with its volume partially above the liquid surface, the
volume of the liquid displaced by the body is equal to the volume of
submerged portion of the body.”
I.

iv.

Example Physics Problem Using Idea or Method in Your Area of Interest
• A floating balloon will be due to filling it with a gas with lower density than
air.
• A hot-air balloon will be filled with a gas that has low density. This
v.
Solution and Explanation of Your Example Physics Problem
• It is critical to ensure that the density of the gas used in air hot-balloon is
lower than the density of the air.
• This will help the balloon to lift the weight of the basket and of the people
IV.
IDEA OR METHOD #3: BUOYANCY AND CONSERVATION OF MOMENTUM (An octopus
splashing out water)
i.
Chapter Containing Idea or Method
• The chapter where conservation of momentum is discussed in the book is
Part II from page 278 to 354.
ii.
Physics of Idea or Method
• The conservation of momentum fluid indicates that in fluid mechanics, the
second law of Newton is normally known as linear momentum equation.
• It states that “the momentum of a system remains constant when the net
force acting on it is zero.
iii.
Relationship to Your Single Area of Interest
• A fluid, such as Newtonian fluids, gases and water, is characterized by its
viscosity.
• The viscous impacts are in the stress tensor of the viscous. Buoyancy is
critical in physical phenomenon that arise from changes in density.
iv.
Example Physics Problem Using Idea or Method in Your Area of Interest
• An example of conservation of momentum in fluid is seen when an octopus
• When an octopus swims, a jet of water is expelled out. Therefore, the
momentum of the water and that of the octopus will stay the same, thus
conserving momentum.
• The force of the water that comes out of the siphon is opposed in equal
measure by the force that the body of the octopus moves in the opposite
direction.
V.
IDEA OR METHOD #4: BUOYANCY AND OSCILLATION AND WAVES
i.
Chapter Containing Idea or Method
• The chapter where oscillation and waves is discussed in the book is Part II
from page 484 to 549.
ii.
Physics of Idea or Method
• Internal waves are buoyancy waves that are caused by changes in density.
• These waves propagate at the interface between a layer of warm water over
a layer of cold water.
• Even though this may be hidden from our eyes, the interior of the ocean is
turbulent as the surface.
iii.
Relationship to Your Single Area of Interest
• Buoyancy waves that are caused by changes in density.
• These waves propagate at the interface between a layer of warm water over
a layer of cold water.
• If the driving frequency is close to the natural frequency of the system, there
is a likelihood that the oscillation amplitude will increase to a point that the
water ...

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