COEFFICIENT OF FRICTION RESEARCH LABORATORY WRITE UP Composition

DETERMININGВ THEВ COEFFICIENTВ OFВ STATICВ FRICTIONВ

DETERMININGВ THEВ COEFFICIENTВ OFВ

STATICВ FRICTIONВ

MARKВ CLUBINEВ В­В SPHВ 3UIВ

В 

DETERMININGВ THEВ COEFFICIENTВ OFВ STATICВ FRICTIONВ

INTRODUCTION

ForceВ isВ " anyВ causeВ thatВ В produces, В changesВ orВ stopsВ theВ motionВ ofВ anВ object” (Jackson, В 2013). В В ItВ isВ aВ vectorВ valueВ usedВ toВ measureВ theВ actionВ producingВ motion. В ThisВ measurementВ includesВ aВ magnitude, В unitВ andВ directionВ ofВ theВ objectВ inВ motion. В InВ ourВ universe, В thereВ areВ manyВ В forcesВ atВ workВ suchВ asВ gravitational, В magneticВ andВ nuclear. В В InВ thisВ lab, В weВ observedВ theВ forceВ ofВ frictionВ actingВ betweenВ aВ shoeВ andВ aВ desk. В В В

Newton'sВ SecondВ LawВ statesВ thatВ theВ accelerationВ ofВ anВ objectВ dependsВ inverselyВ onВ itsВ В massВ andВ directlyВ onВ theВ unbalancedВ forceВ appliedВ toВ it. В ToВ describeВ thisВ law, В theВ proportionalityВ aО± mf В В isВ used. В Further, В weВ areВ ableВ toВ deriveВ theВ equationВ f net = ma В fromВ this. В

()

" f ” representsВ anВ unbalancedВ forceВ actingВ uponВ anВ objectВ andВ it'sВ direction. В " meters ” representsВ theВ massВ ofВ theВ objectВ beingВ actedВ uponВ andВ " a ” isВ theВ acceleration, В beingВ theВ rateВ ofВ changeВ perВ unitВ ofВ timeВ В В В В В В ( ms2 ). ManyВ forcesВ mayВ beВ actingВ onВ aВ singleВ objectВ but, В byВ addingВ determinedВ vectors, В weВ areВ ableВ toВ findВ theВ netВ forceВ ( f net) В causingВ motion. В В В

InВ additionВ toВ unbalancedВ forces, В theВ forceВ ofВ frictionВ alsoВ affectsВ theВ object. В ThisВ forceВ isВ isВ dependentВ onВ theВ typesВ ofВ materialsВ inВ contactВ andВ theВ normalВ force. В ItВ canВ beВ representedВ mathematicallyВ throughВ theВ equationВ farreneheit friction = Ој Г— f normalВ В. В Newton'sВ ThirdВ LawВ statesВ thatВ forВ everyВ actionВ force, В thereВ isВ anВ equalВ andВ oppositeВ reactionВ force. В TheВ reactionВ forceВ betweenВ twoВ objectsВ isВ knownВ asВ theВ NormalВ ForceВ ( f normal) В andВ isВ alwaysВ perpendicularВ toВ theВ forceВ causingВ contactВ betweenВ objects. В WithВ greaterВ mass, В aВ greaterВ NormalВ ForceВ isВ producedВ thusВ creatingВ moreВ friction. В Further, В materialsВ behaveВ differentlyВ whenВ inВ contactВ dueВ toВ attractionsВ atВ theВ atomicВ levelВ causedВ byВ irregularitiesВ andВ electromagneticВ attraction, В contributingВ toВ friction. В TheВ greekВ letterВ " Ој ” (mu)В isВ В scalarВ valueВ thatВ representsВ thisВ conversation, В knownВ asВ theВ CoefficientВ ofВ Friction. В SinceВ itВ isВ simplyВ theВ representationВ ofВ aВ ratioВ f

( Ој sama dengan f nf ), В Ој В hasВ noВ unitВ valueВ associatedВ withВ it. В Ој isВ usedВ toВ representВ twoВ formsВ ofВ friction: В kineticВ andВ static. В TheВ CoefficientВ ofВ KineticВ FrictionВ isВ theВ relationshipВ betweenВ twoВ objects, В includingВ oneВ withВ aВ velocity. В TheВ CoefficientВ OfВ StaticВ frictionВ representsВ twoВ objectsВ inВ aВ stateВ ofВ rest. В В Commonly, В theВ CoefficientВ ofВ KineticВ FrictionВ isВ lowerВ dueВ toВ theВ object'sВ initialВ motion. В BothВ formsВ ofВ frictionВ useВ identicalВ equationsВ butВ mustВ beВ usedВ carefullyВ dueВ toВ theirВ twoВ differentВ representations. В

InВ thisВ lab, В weВ investigatedВ theВ coefficientВ ofВ staticВ frictionВ betweenВ aВ shoeВ andВ aВ tableВ byВ measuringВ theВ forceВ neededВ toВ counteractВ theВ forceВ ofВ friction. В ToВ detirmineВ theВ relationship, В theВ equasionsВ В f net = mum, В farreneheit f = Ој Г— f nВ andВ В n pull sama dengan f frictionВ В wereВ used. В В

MATERIALSВ

в—Џ NewtonВ SpringВ ScaleВ В

в—Џ ShoeВ

в—Џ ElectronicВ BalanceВ

в—Џ TapeВ

в—Џ VariousВ MassesВ

В 

DETERMININGВ THEВ COEFFICIENTВ OFВ STATICВ FRICTIONВ

FigureВ 1. В ExperimentalВ SetВ Up. В

PROCEDUREВ

1 ) В TheВ soleВ ofВ theВ shoeВ wasВ cleanedВ thoroughlyВ

installment payments on your В MassesВ wereВ addedВ toВ increaseВ frictionВ andВ assureВ aВ moreВ accurateВ readingВ three or more. В TheВ shoeВ andВ massesВ wereВ massedВ usingВ anВ electronicВ balanceВ some. В TheВ NewtonВ SpringВ ScaleВ wasВ hookedВ intoВ placeВ usingВ aВ pullВ tabВ locatedВ onВ theВ rearВ ofВ theВ shoeВ

5. В TheВ NewtonВ SpringВ ScaleВ wasВ pulledВ andВ justВ asВ theВ shoeВ beganВ toВ move, В aВ measurementВ ofВ forceВ wasВ recordedВ

OBSERVATIONSВ

ForceВ

(N)В

10В

a few. 4В

five. 5В

5. 4В

a few. 6В

5. 2В

a few. 3В

five. 4В

your five. 4В

a few. 4В

five. 5В...

Sources: Jackson, В S. В (2013)В 2. 1В DynamicsВ andВ Force. В RetrievedВ from:

http://mrjackson.ca/educate/Unit_2_В­_Forces.htmlВ onВ MayВ 13, В 2014В

Jackson, В S. В (2013). В 2. 7В Friction. В RetrievedВ from:

http://mrjackson.ca/educate/Unit_2_В­_Forces.htmlВ onВ MayВ 13, В 2014В

Jackson, В S. В (2013). В 2. 2В Newton'sВ SecondВ Law. В RetrievedВ from: В

http://mrjackson.ca/educate/Unit_2_В­_Forces.htmlВ onВ MayВ 13, В 2014В

CoefficientВ ofВ friction. В (2003)В RetrievedВ from:

http://www.thefreedictionary.com/coefficient+of+frictionВ onВ MayВ 14, В 2014В

Terbush, В J. В WhatВ causedВ KevinВ Ware 'sВ horrificВ legВ injury? В (2013)В RetrievedВ from:

http://theweek.com/article/index/242130/whatВ­causedВ­kevinВ­waresВ­horrificВ­legВ­injuryВ on

MayВ 14, В 2014В

FIA. В (2013)В В RulesВ andВ RegulationsВ В­В Tyres. В RetrievedВ from: В

OnВ

MayВ 15, В 2014В

WikipediaВ (2013)В FormulaВ OneВ Tyres. В RetrievedВ from:

http://en.wikipedia.org/wiki/Formula_One_tyresВ OnВ MayВ 15, В 2014В

(2002). В PhysicsВ ConceptsВ andВ Connections. В Toronto: В IrwinВ PublishingВ Ltd.



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