Transcript PowerPoint Presentation - 5A = Sec 1 = Organizing the Elements pp

This is 3 D. We are doing section 4 before
section 3. That is Boyle’s Law before
Archimedes’
Ch 3.3 States of
Matter
Physical Science 08
Lee Ann Youse
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1
3.3 B
4/8/2015
3.3 Quizzes
 3.3 A Questions 45-54 tomorrow--Tuesday
 3.3 B Questions 45-64 (but mostly 55 -64) the next day--
Wed
 Remember ‘Half’ Test for section 3.3 & 3.4 will be the day
after that--Thurs. It will add with the ‘Half’ Test we took
on 3.1 & 3.2. THERE WILL BE NO TEST ON ALL OF
CHAPTER 3 AT THE SAME TIME. What were those book
authors thinking!!!!! 
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Define pressure
 The amount of force
 exerted on
 a given area of surface 
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3
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Give how fluids are different (from
solids )
 They exert pressure evenly in all directions 
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4
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Review Kinetic Theory of Matter
 .
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5
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Using the kinetic theory of matter to explain
how air in a tire (or balloon) works
 Tiny air particles
 push (force) against each other and against the sides,
 causing pressure in all directions 
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Give the formula for pressure in
words and symbol form
 Pressure is equal to force divided by area

P =
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F
A
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Give the formula symbol for pressure
P
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Give the formula symbol for force
F
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Give the formula symbol for area
A
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Give the SI unit and its
abbreviation for pressure
pascal
Pa
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Give the SI unit and its
abbreviation for force
newton
N
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Give the SI unit and its
abbreviation for area
meters squared
m2
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On a clean Sheet of Paper
 Calculate Pressure, Force, or area
 Write the formula (rearrange if necessary)
 Substitute # in formula
 Calculate
 Write Answer with correct unit.
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Quiz tomorrow
on Q 45-54
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Define buoyant force
 An upward
 push
 exerted by a fluid 
http://www.sciencewithme.com/images/uploads/Image/articles/Boat/ice.jpg
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Explain how buoyant force works
 Pressure (F/A) increases with depth.
 The force pushing up is greater than the force pushing
down.
 The net force is upward 
http://room34pstext.wikispaces.com/8.8+D
ensity+and+Buoyancy
video near the bottom of this page
http://demo.physics.uiuc.edu/lectdemo/scripts/demo_descript.idc?DemoID=759
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State and use Archimedes’ Principle
 The buoyant force on an object in a fluid
 is an upward force equal to the weight
 of the fluid displaced (moved aside) 
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http://www.mcs.drexel.edu/~crorres/Archimedes/contents.html
http://www.mcs.drexel.edu/~crorres/Archimedes/contents.html
http://www.ssl.umd.edu/projects/ControlStation/Personal/SCUBA/Physics&P
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hys/physics.html
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Using Archimedes’ Principle,
explain how to
determine whether an object will float or sink
 Compare the buoyant force on the object with the
object’s weight.
 If the buoyant force is equal to the weight then the object
will float.
 If buoyant force is less then the object will sink. 
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Demo “A SHIP, A ROCK AND A LOG”

http://www.onr.navy.mil/focus/blowballast/sub
/work2.htm
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Using the quantity, density, explain how to
determine whether an object will float or sink
 If the density is greater than the density of water, then it
will sink.
 If the density is less than the density of water, it will float.

http://www.dynamicscience.com.au/tester/solutions/flight/buoyancy.htm
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explain how various
materials that are denser than water can still
float on water (i.e., a steel ship, sub, etc.)
Using Archimedes’ Principle and density,
 Ships have the steel pushed out into a hollow shape. The
shape is larger and pushes more water aside,
 giving it a larger buoyant force.
 Since there is air as well as steel in the ship,
 the density of the whole ship is less than that of water. 
http://3.bp.blogspot.com/_zSLJzcRUXK0/SYEK_Io7nyI/AAAAAAAAAJI/qrped9
K3N1c/S226/buoyant2.gif
http://askville.amazon.com/physical-principle-work-calledbuoyancy/AnswerDetails.do?requestId=64523085&responseId=64556921
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State and use Pascal’s Principle
http://dixiehu.files.wordpress.com/2008/02/pascals-law.jpg
 Pressure
 Applied to a fluid
 Is transmitted unchanged
 through out the fluid.
 (toothpaste tube, Cartesian Diver, hydraulic devices) 
video
http://www.wfu.edu/physics/demolabs/dem
os/avimov/bychptr/chptr4_matter.htm
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Give and use Pascal’s principle
expressed in mathematical form
Go to website:
http://home.planet.nl/~brink494/hydr
_e.htm
F1
A1
= A2
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F2
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State and use Bernoulli’s Principle
 As the velocity of a fluid increases,
 the pressure exerted by the fluid
decreases
http://abyss.uoregon.edu/~js/images/bernoulli.gif
http://image.wistatutor.com/content/sourcesenergy/wind-turbine.jpeg
 (airplane lift, race car design) 
http://en.wikipedia.org/wiki/Daniel_Bernoulli
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State and use the Venturi Effect
http://en.wikipedia.org/wiki/Venturi_effect
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http://www.abac.co.uk/Spraying/Images/SparayGun%20Working%20Diag.gif
http://dnr.louisiana.gov/sec/execdiv/techasmt/ecep/drafting/b/dr-b13b.gif
http://www.thestudentroom.co.uk/showthread.php?t=1210181
Use the Venturi Effect
Bahrain
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State and use the Venturi Effect
 Fluids flow faster when forced to flow
in narrow places.
 (rapids, garden hose, squirt bottles,
windy
cities, etc.) 
See this video
http://home.earthlink.net/~mmc1919/ventur
i.html
http://en.wikipedia.org/wiki/Giovanni_Battista_Venturi
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State and use the Venturi Effect
 Fluids flow faster when forced to flow
in narrow places.
 (rapids, garden hose, squirt bottles,
windy cities, etc.) 
See this video
http://home.earthlink.net/~m
mc1919/venturi.html
http://en.wikipedia.org/wiki/Giovanni_Battista_Venturi
http://en.wikipedia.org/wiki/Venturi_effect
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The end
Quiz tomorrow
Q 45-64 (mostly
55-64).
“Half” TEST the
next day
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