Transcript Chapter 7 - Holt - Thurgood Marshall Middle School

Chapter 7 - Holt
Forces in Fluids
Section 1 pages 162-167
• A fluid is any material that can _____
and that takes the shape of its
container. Fluids include liquids, such
as _________ and _________, gases
such as ____________ and _________
___________.
• Fluids are able to flow because the
particles in fluids, unlike the particles in
solids can move easily _________ each
other.
• The following equation can be used to
find the pressure, or rearranged to find
force or area.
• Pressure = Force / Area
• The SI unit for pressure is the _______
• Why are bubbles round?
• Why do your ears ‘pop’ when you are in
a plane taking off or in a car travelling
down a steep mountain road?
• The pressure caused by the weight of
Earth’s atmosphere is called
___________ ___________.
• Fluids exert pressure __________ in all
directions
• Fluid pressure ___________ as depth
increases.
• Fluids flow from areas of _________
pressure to areas of _________
pressure.
• Pascall’s Principle states that a change
in pressure at any point in an enclosed
fluid will be __________ __________
to all parts of the fluid.
• __________ devices transmit changes
of pressure through liquids.
Section 2 pages 168-172
• Any object that is more dense that the
surrounding fluid will ________. Any
object that is less dense than the
surrounding fluid will ________.
• All fluids exert an upward force called
__________ force, which is caused by
differences in _________ pressure.
• ______________ Principle states that
the buoyant force on an object is equal
to the weight of the fluid _________ by
the object.
Section 3 pages 173 - 177
• Bernoulli’s Principle states that fluid
pressure decreases as the speed of a
moving fluid _________.
• Concerning flight.
• Wings are often shaped to allow
airplanes (and birds) to take advantage
of decreased pressure in moving air in
order to achieve ____________.
• ________ is an upward force that acts
against ________.
• _______ opposes motion through fluids
• Lift on an airplane is determined by
_________ size and ________.
• Thrust is the forward motion produced
by the __________ of an airplane.
questions
• 1. Compared with an empty ship, will a
ship loaded with plastic-foam balls float
higher or lower or the same level in
water?
• Explain your answer.
• 2. If an object weighing 50 N displaces
a volume of water with a weight of 10 N,
what is the buoyant force on the object?
• Show your equation and work.
• 3. A helium-filled balloon will float in air
because _______________________
• 4. Where is warer pressure greater?
• At a depth of 1 m in an ocean, or , at a
depth of 2 m in a small pond?
• Explain your answer.
• Inside all vacuum cleaners is a highspeed fan. Explain how this fan causes
dirt to be picked up by the vacuum
cleaner.
• Look at Interpreting Graphics page 181.
• Answer questions 21,22,23,24
concerning icebergs.
• THE END