人教版八年级下册：物理知识点(详细)-精选.pdf

11.2.3.123451.__2._3.2.(F)1.N()2123.4.1.2.::;;:,,,;3.???4.(1)(2)(3)(4)5N3G1.2.3.:4.1.2.3.()ABC4,G,,,,(A)AGBGCGDGFFXFmGkgNm=vG=mgG=mgg=9.8N/kg5=G+1::,,:,,2AB,,C345126123456;(7)8123451212364345121236127128()()12317234456789AB9,112345123FpSFN8Sm2p/N/m2/Pa1N/m2=1Pa4()()521212343p=gh/kg/m3g9.8N/kghmpPap=ghF=GpF/Sp=ghF=PSp=ghF=GpF/S12331?923(1)1m760mm(2)=(3)p0=760mmHg=76cmHg=1.01105Pa()AB10.3mCD76cm1=760mmHg=76cmHg=1.01105Pa345612760mm1=760mm()=1.013105Pa105Pa13000m10m100Pa210034412121034(1)(2)FGF=GFGF=G=(3)1/3(2/3)F=GVg=Vg=VV=23F=G=V=VVVFGG,F=G/(G-F)5(1)(2)F=G=Vg(3)GFGFGFGFFG11VVFGV=VF=G=FGF=GV67(1)tmV=m/G=mgF=mgG=mg(2)(3)(4)81F=F-F122F=G-F3F=G4F=G=gV(1)(2)()(3):1FGG14N3.5N_________N=_________2F=FF22.2.31.5___________3F=gV=G350cm3=0.8103kg/m3g10N/kg4F=GF=G+F3F=G-F34200gg10N/kg125F=gF=Gg6510N0.8dm3g10N/kg6890g=8.9g/cm3=13.6g/cm3g10N/kg1113234W=FsFNsmw?J1J=1N?m5W=GhW=fs6FS=Gh2123P=WtWJtsPW4J/sW1W=1J/skW1kW=103W3123()1141233123()4123411O2OF1F2l1l2315F1l1F2l241l1l2F1F22l1l2F1F23l1l2F1F221F=GsFvF=sGvG2212FG1+2FGGsFvF=2sGvG31FGn1FGGnsFvFnsGvGGGnF31WGhWW=16WGh2=WW=GhFL=GhGhGFSFhF=22GhGhGFSFhF=GhGhGFSFnhnF5160%60%671=WGhWFS2GhFs3458