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1、初中物理单位及公式A,density(P):1,Definition:themassofasubstanceinaunitvolumeiscalledthedensityofsuchasubstance.2,theformula:P=m/vv=m/Pm=VP:deformationMforobjectquality,themainunitkg,commonlyusedunits:T,G,mg;Visthevolumeofanobject,themainunitcm3,M33,unit:internationalunitsystem:kg/m3commonunitg/cm3uni
2、tconversionrelationship:lg/cm3=103kg/m3Thedensityoflkg/m3=10-3g/cm3wateris1*103kg/m3andreads1*103kgpercubicmeter,whichmeansthatthephysicalmeaningis1cubicmetersofwaterwithamassof1*103kg.Two,speed(V):1.Definition:inuniformrectilinearmotion,velocityisequaltothedistaneetraveledbyamovingobjectinu
3、nittime・Physicalmeaning:velocityisthephysicalquantitythatindicatesthespeedofanobject2,formula:v=s/tdeformation:s=vtt=s/vSfortheobjectofthejourney,thecommonlyusedunitsforKMm;tfortheobjectusedbythetime,commonlyusedunitsforSH2,units:internationalsystemofunits:m/scommonlyusedunitskm/hconversion:
4、lm/s=3・6km/h.Three,gravity(G):1.Definition:theforcenearthegroundduetotheattractionoftheearthiscalledgravity2.Formula:G=mgMisthephysicalmass;Gisthecoefficientofgravity,g二9・8N,/kg,roughlyg二lON/kg3units:Newtonreferredtoascattle,expressedinNFourleverprinciple1.Definition:thebalanceconditionoflev
5、erispower*powerarm二resistance*resistancearm2,formula:Fl*ll二F2*12canalsobewrittenas:Fl/F2=12/LIAmongthem,Flistheforcethatmakestheleverrotate,namelypower;LIisthedistancefromthefulcrumtothedynamicactionline,thatis,thedynamicarm;F2istheforcethatblockstherotationofthelever,thatis,resistance;L2ist
6、hedistaneefromthefulcrumtothelineofresistance,thatis,theresistancearmFive,pressure(P):1.Definition:thepressureonaunitareaofanobjectiscalledpressure・Physicalmeaning:pressureisthephysicalquantitythatindicatestheeffectofpressure・2.Formula:P二F/SFisthepressure,thecommonunitNewton(N);theSistheforc
7、earea,andthecommonlyusedunitism2(M2)3.theunitis:Pascal(Pa)Six,liquidpressure(P):Formula:P二1,PGHWherepisthedensityofliquid,commonlyusedkg/m3g/cm3;Ggravitycoefficient,g=9・8N/kg;Hisdepth,commonlyusedinunitsm,CM2,theunitis:Pascal(Pa)Seven,Archimedespri
