牛顿第一定律(英文)PPT资料.ppt

牛顿第一定律(英文)PPT资料.ppt

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NewtonsFirstLawofNewtonsFirstLawofMotionMotionLawofInertiaMihaLeeNewtonsFirstLawofMotionNewtonsFirstLawofMotionEveryobjectinastateofuniformmotiontendstoremaininthatstateofmotionunlessanunbalancedforceisappliedtoit.AnobjectatrestAnobjectinmotionAnObjectatRestAnObjectatRestAnObjectinMotionGalileosthoughtexperimentIAnObjectinMotionGalileosthoughtexperimentIIFrictionalforceFrictionalforceFrictionFrictionistheforcethatactsonamovingobjecttoslowitdownandbringittostop.Question1:

@#@Evaluatethefollowingassertion.Ifthereisnofrictionalforceontheroad,carscanmovewithoutconsumptionofenergybytheNewtonsfirstlawofmotion.Sowecansaveenergy.AnObjectinMotionAnObjectinMotionAdynamiccartwithabrickonit.Getitmovingandstopped.Tapethebricktothecart.Getitmovingandstoppedagain.Seatbeltsprotectusfrombeinghurtbykeepingustiedtothevehicle.AnObjectinMotionInertiaInertiaTheresistanceanobjecthastoachangeinitsstateofmotion.Question2:

@#@Whatdoesthemagnitudeofinertialforcedependon?

@#@F=mam:

@#@inertialmassApplicationtoeverydaylifeOpeningabottleRemovingdustsfromclothsSeatbeltsSeismometerSeatBeltSeatbeltscanexertforcestocausepassengerstoslowdownatthesamerateasthevehicle.Question3:

@#@Howdoesaseatbeltexertforceonus?

@#@TheprincipleofretractorsTheprincipleofretractors