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物理学专业英语A1【通用】.ppt

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物理学专业英语A1【通用】.ppt*PhysicsProfessionalEnglish物理学专业英语PhysicsProfessionalEnglishA1Motion,mass,.....*A1Motion,mass,andforcesScientistsmakemeasurementsusingSIunitssuchasthemetre,kilogram,second,,,unitswillbeexcludedfromsomestagesofthecalculationsinthisbook,asinthisexample:totallength=2+3=5mStrictlyspeaking,thisshouldbewritten:totallength=2m+3m=5mUnitsofmeasurement.....*A1Motion,mass,(m).Quantities,suchasdisplacement,whichhavebothmagnitude(size)anddirection,,withhorizontalorverticalmotion,itisoftenmoreconvenienttousea‘+’or‘-’:Movementof12mtotheright:displacement=+12Movementof12mtotheleft:displacement=-12Displacement12m.....*A1Motion,mass,,whentheballbelowhasreturnedtoitsstartingpoint,,.....*A1Motion,mass,andforcesAveragespeediscalculatedlikethis:distancetravelledaveragespeed=timetakenTheSIuintofspeedisthemetre/second,abbreviatedasms-,ifanobjecttravels12min2s,itsaveragespeedis6ms-:displacementaveragespeed=timetakenTheSIunitofvelocityisalsothems-,.....*A1Motion,mass,andforcesThevelocityaboveisforaparticlemovingtotherightat6ms-,aswithdisplacement,itisoftenmoreconvenienttousea‘+’or‘-’,ifaballisthrownupwardsandtravelsatotaldistanceof10mbeforereturningtoitsstartingpoint2slater,itsave

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