Lab 7: Projectile Motion
Lab 7: Projectile Motion
Lab 7: Projectile Motion
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<strong>Lab</strong>7:<strong>Projectile</strong><strong>Motion</strong>Conceptstoexplore: Scalersvs.vectors<strong>Projectile</strong>sParabolictrajectoryFigure1:Theverticalandhorizontalforcesrequiredtopullagliderintoflightcanbeachievedwithonetowrope.Asyoulearnedpreviously,aquantitythatconveysinformationaboutmagnitudeonlyiscalledascalar.However,whenaquantity,suchasvelocity,conveysinformationaboutmagnitudeanddirection,wecallitavector.Alongwithcarryingthatextrabitofinformationaboutthepathofmotion,vectorsarealsousefulinphysicsbecausetheycanbeseparatedintocomponents.Infact,anyvectorcanberesolved(brokendown)intoanequivalentsetofhorizontal(xdirection)andvertical(ydirection)components,whichareatrightanglestoeachother.Aprojectileisanobjectactedonbygravityalone.Typically,aprojectileisanyobjectwhich,onceprojected,continuesinmotionbyitsowninertiaandisinfluencedonlybythedownwardforceofgravity.RememberthatNewton’sLawsdictatethatforcescauseacceleration,notsimplymotion.Therefore,theonlyforceactingonaprojectileinitsFreeBodyDiagramistheforceofgravitydownward.Thismayseemcounterintuitivesincetheobjectmightinitiallybemovinginseveraldirections,bothhorizontallyandvertically,butgravityactsonlyontheverticalmotionoftheobject.Figure2:Someexamplesofprojectilesareacannonballfiredfromacannon,abaseballhitbyabat,andballsbeingjuggled.79
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