1.Goto: http://phet.colorado.edu/en/simulation/forces-1d

2.ClickRunNow!

3.Click"GraphAppliedForce","GraphAcceleration","GraphVelocity"and"Graph Postion".

4.TurnoffFriction.Forthefirstpartofthisactivitywewillnotbeconsideringfriction.When friction is not present we are in "Ideal Physics World"not the real world.

5.Playwiththesimulationabittofigureouthowitworks.

AnswerallquestionsinCOMPLETESENTENCES!

Part1

1. Applya50Nforcetothe5differentobjects,fillouttablewiththerecordeddataandobservations.
2. Thenapply4moreforces(differentfrom50N) tothedogandfilloutthetablewiththerecordeddata and observations.
3. Nowapply4moreforces(differentfrom50N) totheFilingCabinetandfilloutthetablewiththe recorded data and observations.

Object	Object'sMass (kg)	ForceYou Applied(N)	Accelerationof object (m/s2)	FrictionForce(N)	ResultofAppliedForceontheobjects velocity.
FileCabinet		50N
Refrigerator		50N
Textbook		50N
Crate		50N
Dog		50N
Dog
Dog
Dog
Dog

Dog
Filing Cabinet
Filing Cabinet
Filing Cabinet
Filing Cabinet

2.Describethemotionof theFileCabinet whileaconstant,50N,netforcewasappliedtothatobject.Be sure to use physics termsand to discuss the object's acceleration, velocity and positon.

3.Hit the Clear Button.Choose the Refrigerator and apply a 250N force to the Refrigerator.After approximately 6 seconds type in 0N to the applied force and hit return (you have removed the Applied Forcefromthefilecabinet).DescribethemotionoftheRefrigerator(usingphysicsterms!)duringthis experiment.Be sure to discuss the object's velocity and acceleration.

4.What do you have to do to get the filing cabinet and the dog to accelerate at the same rate?Using your observationsanddatafromyourtable,determineamathematicalrelationshipbetweenForce,Massand Acceleration.Show all your work!The answer is a linear equation between 3 variables.

5.Nowthatyouhaveahypothesisbasedonexperimentalresults,testyourhypothesisusingtheSimandthe textbook.Providedatafromyourexperimentonthetextbookthatprovidesevidenceforyourconclusion.

Part2:Forthispartwearegoingtolookatmore"real-worldsituations"soturnfrictionback on.

6.Ifyouapplythesameforcetoobjectsofdifferentmasses,whatdoyouobserve (providespecificdatathat you obtain from the graphs in the simulation)?

Object	AppliedForce	Result/Observation

7.Ifyoupushonanobject,whydoesn'titmoverightawaylikeitdidinPart1?Usephysicsterms!

8.Whenthereisfriction,atwhatpointdoesanobjectbeginmoving?

9.

a.Usingthefilingcabinet,whatisthemagnitudeoftheforceofstaticfriction?Howdoyou know?

b.Usingthesleepingdog,whatisthemagnitudeoftheforceofstaticfriction?Howdoyouknow?

10.Gointo"morecontrols"andchange thesettingssothatweareonanotherplanet.Recordthe strength of gravity on your new planet: .

a.Usingthefilingcabinet,whatisthemagnitudeoftheforceofstaticfriction?Howdoyou know?

b.Usingthesleepingdog,whatisthemagnitudeoftheforceofstaticfriction?Howdoyou know?

11.Whydidyouranswersfrom#9and#10differ?Analyzethedifferences.Dotheymakesense?

12.ChallengeQuestion:PredictthemagnitudeofstaticfrictiononMarswheretheaccelerationdue to gravity is 3.71 N/kg?Why do you believe it will have this value?Does this make sense?