Ch 3.3 States Ch 3.3 States of Matterof Matter

Physical Science 08Physical Science 08Lee Ann YouseLee Ann Youse

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This is 3 D. We are doing section 4 before section 3. That is Boyle’s Law before Archimedes’

3.3 B04/19/231

3.3 Quizzes3.3 Quizzes

3.3 A Questions 45-54 tomorrow--Tuesday3.3 A Questions 45-54 tomorrow--Tuesday 3.3 B Questions 45-64 (but mostly 55 -64) 3.3 B Questions 45-64 (but mostly 55 -64)

the next day--Wedthe next day--Wed Remember Remember ‘‘HalfHalf’’ Test for section 3.3 & 3.4 Test for section 3.3 & 3.4

will be the day after that--Thurs. It will add will be the day after that--Thurs. It will add with the with the ‘‘HalfHalf’’ Test we took on 3.1 & 3.2. Test we took on 3.1 & 3.2. THERE WILL BE NO TEST ON ALL OF THERE WILL BE NO TEST ON ALL OF CHAPTER 3 AT THE SAME TIME. What were CHAPTER 3 AT THE SAME TIME. What were those book authors thinking!!!!! those book authors thinking!!!!!

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Define pressureDefine pressure

The amount of forceThe amount of force

exerted onexerted on

a given area of surface a given area of surface

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Give how fluids are different Give how fluids are different (from solids )(from solids )

They exert pressure evenly in all directions They exert pressure evenly in all directions

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Review Kinetic Theory of Review Kinetic Theory of Matter Matter

..

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Using the kinetic theory of matter Using the kinetic theory of matter to explain how air in a tire (or to explain how air in a tire (or

balloon) worksballoon) works

Tiny air particlesTiny air particles

push (force) against each other and against push (force) against each other and against the sides,the sides,

causingcausing pressure in all directions pressure in all directions

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Give the formula for Give the formula for pressure in words and pressure in words and

symbol form symbol form Pressure is equal to force divided by area Pressure is equal to force divided by area

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Give the formula symbol for Give the formula symbol for pressure pressure

PP

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Give the formula symbol Give the formula symbol for forcefor force

FF

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Give the formula symbol Give the formula symbol for areafor area

AA

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Give the SI unit and its Give the SI unit and its abbreviation for abbreviation for

pressurepressure

pascalpascal

PaPa

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Give the SI unit and its Give the SI unit and its abbreviation for forceabbreviation for force

newtonnewton

NN

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Give the SI unit and its Give the SI unit and its abbreviation for areaabbreviation for area

meters squaredmeters squared

mm22

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On a clean Sheet of On a clean Sheet of PaperPaper

Calculate Pressure, Force, or areaCalculate Pressure, Force, or area

Write the formula (rearrange if necessary)Write the formula (rearrange if necessary)

Substitute # in formulaSubstitute # in formula

CalculateCalculate

Write Answer with correct unit.Write Answer with correct unit.

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Quiz Quiz tomorrow on tomorrow on

Q 45-54Q 45-54

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Define buoyant Define buoyant forceforce

An upward An upward

push push

exerted by a fluid exerted by a fluid

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http://www.sciencewithme.com/images/uploads/Image/articles/Boat/ice.jpg

Explain how buoyant Explain how buoyant force works force works

Pressure (F/A) increases with depth. Pressure (F/A) increases with depth.

The force pushing up is greater than the The force pushing up is greater than the force pushing down. force pushing down.

The net force is upward The net force is upward

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http://room34pstext.wikispaces.com/8.8+Density+and+Buoyancyvideo near the bottom of this page

http://demo.physics.uiuc.edu/lectdemo/scripts/demo_descript.idc?DemoID=759

State and use ArchimedesState and use Archimedes’’ Principle Principle

The buoyant force on an object in a fluid The buoyant force on an object in a fluid

is an upward force equal to the weight is an upward force equal to the weight

of the fluid displaced (moved aside) of the fluid displaced (moved aside)

PS08 14 Slides & 27 Slides

http://www.mcs.drexel.edu/~crorres/Archimedes/contents.htmlhttp://www.mcs.drexel.edu/~crorres/Archimedes/contents.htmlhttp://www.mcs.drexel.edu/~crorres/Archimedes/contents.htmlhttp://www.mcs.drexel.edu/~crorres/Archimedes/contents.html

04/19/2318

http://www.mcs.drexel.edu/~crorres/Archimedes/contents.htmlhttp://www.ssl.umd.edu/projects/ControlStation/Personal/SCUBA/Physics&Phys/physics.html

http://www.mcs.drexel.edu/~crorres/Archimedes/contents.htmlhttp://www.ssl.umd.edu/projects/ControlStation/Personal/SCUBA/Physics&Phys/physics.html

Using ArchimedesUsing Archimedes’’ Principle Principle, explain how to , explain how to determine whether an object will determine whether an object will

float or sink float or sink

Compare the buoyant force on the object Compare the buoyant force on the object with the objectwith the object’’s weight. s weight.

If the buoyant force is equal to the weight If the buoyant force is equal to the weight then the object will float. then the object will float.

If buoyant force is less then the object will If buoyant force is less then the object will sink. sink.

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Demo Demo ““A SHIP, A ROCK AND A SHIP, A ROCK AND A LOGA LOG””

http://www.onr.navy.mil/focus/http://www.onr.navy.mil/focus/blowballast/sub/work2.htmblowballast/sub/work2.htm

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Using the quantity, density, explain Using the quantity, density, explain how to determine whether an object how to determine whether an object

will float or sink will float or sink

If the density is greater than the density of If the density is greater than the density of water, then it will sink. water, then it will sink.

If the density is less than the density of If the density is less than the density of water, it will float. water, it will float.

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http://www.dynamicscience.com.au/tester/solutions/flight/buoyancy.htm

Using ArchimedesUsing Archimedes’’ Principle and density, Principle and density, explain explain how various materials that are how various materials that are

denser than waterdenser than water can still float can still float on water on water (i.e., a steel ship, sub, etc.) (i.e., a steel ship, sub, etc.)

Ships have the steel pushed out into a Ships have the steel pushed out into a hollow shape. The shape is larger and hollow shape. The shape is larger and pushes more water aside, pushes more water aside,

giving it a larger buoyant force. giving it a larger buoyant force.

Since there is air as well as steel in the Since there is air as well as steel in the ship,ship,

the density of the whole ship is less than the density of the whole ship is less than that of water. that of water.

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http://3.bp.blogspot.com/_zSLJzcRUXK0/SYEK_Io7nyI/AAAAAAAAAJI/qrped9K3N1c/S226/buoyant2.gifhttp://askville.amazon.com/physical-principle-work-called-buoyancy/AnswerDetails.do?requestId=64523085&responseId=64556921

State and use PascalState and use Pascal’’s s PrinciplePrinciple

Pressure Pressure

Applied to a fluidApplied to a fluid

Is transmitted unchangedIs transmitted unchanged

through out the fluid.through out the fluid.

(toothpaste tube, Cartesian Diver, hydraulic (toothpaste tube, Cartesian Diver, hydraulic devices) devices)

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videohttp://www.wfu.edu/physics/demolabs/demos/avimov/bychptr/chptr4_matter.htm

http://dixiehu.files.wordpress.com/2008/02/pascals-law.jpg

Give and use PascalGive and use Pascal’’s s principle expressed in principle expressed in

mathematical formmathematical form

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Go to website:http://home.planet.nl/~brink494/hydr_e.htm

State and use BernoulliState and use Bernoulli’’s s PrinciplePrinciple

As the velocity of a fluid As the velocity of a fluid increases, increases,

the pressure exerted by the the pressure exerted by the fluid decreasesfluid decreases

(airplane lift, race car (airplane lift, race car design) design)

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http://en.wikipedia.org/wiki/Daniel_Bernoulli

http://image.wistatutor.com/content/sources-energy/wind-turbine.jpeg

http://abyss.uoregon.edu/~js/images/bernoulli.gif

State and use the Venturi State and use the Venturi Effect Effect

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http://en.wikipedia.org/wiki/Venturi_effect

Use the Venturi Effect Use the Venturi Effect

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http://www.abac.co.uk/Spraying/Images/SparayGun%20Working%20Diag.gifhttp://dnr.louisiana.gov/sec/execdiv/techasmt/ecep/drafting/b/dr-b13b.gifhttp://www.thestudentroom.co.uk/showthread.php?t=1210181

Bahrain

State and use the Venturi State and use the Venturi Effect Effect

Fluids flow faster when Fluids flow faster when forced to flow in narrow forced to flow in narrow places.places.

(rapids, garden hose, squirt (rapids, garden hose, squirt bottles, windy cities, etc.) bottles, windy cities, etc.)

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See this video

http://home.earthlink.net/~mmc1919/venturi.html

http://en.wikipedia.org/wiki/Giovanni_Battista_Venturi

State and use the Venturi State and use the Venturi Effect Effect

Fluids flow faster when Fluids flow faster when forced to flow in narrow forced to flow in narrow places.places.

(rapids, garden hose, squirt (rapids, garden hose, squirt bottles, windy cities, etc.) bottles, windy cities, etc.)

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See this video

http://home.earthlink.net/~mmc1919/venturi.html

http://en.wikipedia.org/wiki/Giovanni_Battista_Venturihttp://en.wikipedia.org/wiki/Venturi_effect

The endThe endQuiz tomorrow Quiz tomorrow Q 45-64 Q 45-64 (mostly 55-64). (mostly 55-64).

““HalfHalf”” TEST the TEST the next daynext day

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