Lab 7: Projectile Motion

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Lab7:ProjectileMotionQuestions1. Ifyouweretothrowaballhorizontallyandatthesametimedropanexactcopyoftheballyouthrew,whichballwouldhitthegroundfirstandwhyisthisso?2. Supposeyoualteredyourexistingrampsothatthemarbleshadtwicetheirinitialvelocityrightbeforeleavingtheramp.Howwouldthischangethetotaldistancetraveledandthetimethatthemarbleswereintheair?3. DrawaFBDforthemarblesbeforeandafteritleavestheramp.4. Describetheaccelerationofthemarblesafteritleavestheramp.5. DidyourpredictioninProcedure2comeclosetotheactualspot?Findthepercenterrorofyourpredicteddistance(expected)comparedtotheactualaveragedistance(observed).Whataresomesourcesoferrorinthisexperiment? %error=observedvalueexpectedvalueX100 expectedvalue 85
Lab7:ProjectileMotionExperiment2:SqueezeRocketprojectilesTheobjectiveofthislabistoobservethedistanceaprojectilewilltravelwhenthelaunchangleischanged.Materials4SqueezeRockets1SqueezeRocketBulbProtractorTapemeasureStopwatchNOTE:Pleaseexercisegreatcautionwhenfiringtheserockets.Besurethelineoffireisclearofpeopleandbreakableobjectspriortolaunchinganyrocket.Rocketswilloftentakeunpredictableflightpaths.Toensuredataprecision,onlyrecordtrialsinwhichtherockettravelsaparabolicpathandcontactsthegroundwiththefrontendfirst.Procedure1. Markthespotfromwhichtherocketswillbelaunched.2. LoadaSqueezeRocketontothebulb.3. Usingaprotractor,aligntherockettoanangleof90°(vertical).4. Squeezethebulb(youwillneedtoreplicatethesamepressureforeachtrial),andsimultaneouslystartthestopwatchuponlaunch(alternatively,haveapartnerhelpyoukeeptime).Measureandrecordthetotaltimetherocketisintheair.Repeatthisstepthreeormoretimes,andaverageyourresults.RecordyourresultsinTable3. t avg =______________5. Calculatetheinitialvelocityoftherocket(v initial =v oy )usingthekinematicsequations.6. RecordyourcalculationinTable3.(Hint:youcantaketheinitialheightaszero.Theverticalvelocityiszeroatthepeakoftheflight,whenthetimeisequaltot/2.)7. Repeatthistrialtwomoretimes,andrecordthevaluesinTable3.8. Choosefouradditionalanglestofiretherocketfrom.Beforelaunchingtherocket,calculatetheexpectedrangeusingtheverticalvelocityandtheanglefromwhichtherocketswillbefired.Rememberthatyoucanusezeroforanyinitialpositions,andthattheaccelerationduetogravity,g,86
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Lab 7: Projectile Motion

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