welcome to phy101: major concepts in physics i

WelcometoPHY101:MajorConceptsinPhysicsI

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Introduction

Coursewebsite:https://jmschwarztheorygroup.org/phy101/

Youcanaccessthesyllabus,courseschedule,homeworkassignments,homeworksolutions,labs,etc.onthecoursewebsite.

GradeswillbeaccessedviaBlackboard.

Whatkindsofthingsarewegoingtolearnaboutinthiscourse?

GameofThrones andprojectilemotion

BreakingBadandelectromagnets

BreakingBadandelectromagnets

AteaserforPHY102!

PleasefillouttheGoogleformatthefollowinglink:

https://forms.gle/hdQSJL5oVo7yoMT28

Yourname

Whatisyourintended/projectedcareer?

Isyourintended/projectedcareerscience-based?

•Whatisscience?

•Whatisphysics?

•Whattoolsdoyouneedtolearnphysics?

Today’sThreeQuestions

•Whatisscience?

•Whatisphysics?

•Whattoolsdoyouneedtolearnphysics?

Today’sThreeQuestions

SeeChapter1oftextbook!

•Whatisscience?Perhapsweshouldhaveaskedthisquestionbefore fillingoutthesurvey.•Whatisphysics?

•Whattoolsdoyouneedtolearnphysics?

Today’sThreeQuestions

SeeChapter1oftextbook!

ActiveLearningExerciseWatchthevideoat:https://mediaplayer.pearsoncmg.com/assets/_frames.true/sci-OALG-1-1-1.a. Comeupwithatleast3explanations(crazyideas)forwhy

thepersonlivinginthishousehas12cameras.

ActiveLearningExerciseWatchthevideo:

a. Comeupwithatleast3explanations(crazyideas)forwhythepersonlivinginthishousehas12cameras.

b.Howcanyoudecidewhichexplanationiscorrect?Youcanconductadditionalexperimentsbutyoucannottalktotheperson.Describetheexperimentsyouplantoperform.

ActiveLearningExerciseWatchthevideo.

a.Comeupwithatleast3explanations(crazyideas)forwhythepersonlivinginthishousehas12cameras.

b.Howcanyoudecidewhichexplanationiscorrect?Youcanconductadditionalexperimentsbutyoucannottalktotheperson.Describetheexperimentsyouplantoperform.

c.Whatoutcomesoftheseexperimentsmightconvinceyouthatcertainexplanations(orallofthem)arenotcorrect?

Science=DetectiveWork

Who’syourfavoriteTVdetective?

Who’syourfavoriteTVdetective?

Who’syourfavoriteTVdetective?

ReginaKingasDetectiveLydiaAdamsinSouthland

InvestigativeLearningScienceEnvironment

Credit:EugeniaEtkina

Whatisscience?

• Scienceisthebodyofknowledgethatdescribestheorderwithinnatureandthecausesofthatorder

• ScienceisanactivitydedicatedtogatheringofknowledgeabouttheworldandorganizingandcondensingitintotestablelawsandtheoriesusingtheScientificMethod

TheScientificMethod

1) Observetheworldaroundyou2) Frameaquestionandformulateahypothesis3) Makeapredictionbasedontheyourhypothesis4) Testyourpredictionwithanexperiment5) Ifpredictionisfalsified, formulateanotherhypothesis;ifpredictionis

validated,makemorepredictions

PioneeroftheScientificMethod:Ibn al-Haytham (Alhazen,965-1039)

ScienceversusPseudoscience

Ahypothesisisscientificonlyifitisfalsifiable!

“Nonumberofexperimentscanprovemeright;asingleexperimentcanprovemewrong.”–AlbertEinstein

Pseudosciencelacksevidenceandpositshypothesesthatarenotfalsifiable.

AGoogleformquickpoll:https://forms.gle/vnXZqi6E5kbw7bK66

Whichofthefollowingisascientifichypothesis?

A.Matterisfilledwithundetectableparticles.B. TheMoonismadeofgreencheese.C. Therearethingswewillneverknowabout.D. Therearepartsoftheuniversethatwillneverbefoundbyhumans.

AGoogleformquickpoll:https://forms.gle/vnXZqi6E5kbw7bK66

Whichofthefollowingisascientifichypothesis?

A.Matterisfilledwithundetectableparticles.B.TheMoonismadeofgreencheese.C. Therearethingswewillneverknowabout.D. Therearepartsoftheuniversethatwillneverbefoundbyhumans.

Inscience

Experimentalevidencemustbereproducible,otherwiseitisnotvalid.

Anyonewouldcommitsfraudiscut-offfromthescientificcommunity.Therearenosecondchances.

Atheoryisasynthesisofalargebodyofinformationthatencompasseswell-testedandsupportedhypotheses.

Theoriesaswellasfactscanchange.

Whatisphysics?It’sknowledgeofnature.

Whatisnature?It’smatterandit’senergy.Theyareindeedrelated.

Howdoesone“piece”ofmatterinteractwithanother“piece”ofmatterintermsofafewfundamentallaws?

Matter:TheStandardModel

http://www.d0.fnal.gov/Run2Physics/WWW/results/fnal/NP/N04C

WhenmatterinteractsI

http://www.particle.kth.se/fmi/kurs/PhysicsSimulation/Images/6b/fysikb1.jpg

WhenmatterinteractsII

Http:/www.ics.uci.edu/eppstein/pix/natx/cubs/

ActiveLearningExerciseWatchvideooftakingaglass(oratransparentplasticcup)andpouringicecoldwaterintoit.

a. Carefullyobservetheglassforafewminutes.Describewhatyouobserveinsimplewords.

b. Thinkofdifferentexplanations(crazyideas)fortheobservedpatterns.Trytodeviseasmanyexplanationsaspossible.

InvestigativeLearningScienceEnvironment

Credit:EugeniaEtkina

Whatdoesittaketolearnphysics?

Weneedaconcisewaytorepresentobservations.Sowriting anddrawingattheleveloflinesandarrowsisneeded.

Whatdoesittaketolearnphysics?

Weneedaconcisewaytorepresentobservations.Sowritinganddrawingattheleveloflinesandarrowsisneeded.

Whatdoesittaketolearnphysics?

Sincemathisaconcisewayofstatingscientificideas,itwillbeusefultoknowalittlemath.Itismerelyalanguagewithcertainrules.

xismultipliedbythefactorm.

Thetermsmxandbareaddedtogether.

bmxy +=

Consider:

Whatdoesittaketolearnphysics?

Sincemathisaconcisewayofstatingscientificideas,itwillbeusefultoknowalittlemath.Itismerelyalanguagewithcertainrules.

Whatisthevolumeofaspherewithradiuscm?

Use: V =43πr3

Vr =1

Whatdoesittaketolearnphysics?

Sincemathisaconcisewayofstatingscientificideas,itwillbeusefultoknowalittlemath.Itismerelyalanguagewithcertainrules.

Whatisthevolumeofaspherewithradiuscm?

Use: V =43πr3

Vr =1

V ∝ r3

37

Dimensions arebasictypesofquantitiesthatcanbemeasuredorcomputed.Examplesarelength,time,mass,electriccurrent,andtemperature.

Aunit isastandardamountofadimensionalquantity.Thereisaneedforasystemofunits.SIunitswillbeusedthroughoutthisclass.

Whatdoesittaketolearnphysics?

BaseDimensions/Units

Ourfirstproblem:Aroughestimate

Howmanycellsarethereinthehumanbody?

PHY101StudentPersonalSurvey

https://forms.gle/z4beToSe3mwoMpKA9