初中物理经典易错题100例：力和运动(附答案解析)

100A.B.C.D.2.,()ABCD3.6/4/A.B.4/C.6/D.4.()A.1B.2C.3D.45200.(A100B200C0D4006.,,()ABCD7.ABCD8.AFF2AAA12BC2D9aC?_______________10.ABFBAB2m/sFBAB20m/sAAABACAADAA11(A),.ABCAAD2.:A,:B,,.3.D4.B5.B6.B7.C8.B9.---10.A1.100---1.,,________cm.2.4,:18.39cm,18.40cm,18.41cm,18.52cm,______cm.3.1.82cm1.87cm1.68cm1.81cmA.1.83cmB.1.833cmC.1.76cmD.1.759cm4.1505.4mmmm5.ABCD6.,24m,36m,4s8m,______.7.,v=s/t()A.vsBvtCstD1.1:3.50cm,1cm0.2:2.5cm,3:3.5cm,12;2.50cm2.1:18.45cm,18.52cm.2:18.4cm,:18.40cm3.A.24.:0.0036mm,5.4mm150=0.0036mm,.:0.0018mm5.4mm75=0.0036mm5.A,,,C6.:.2342\3\4:7.C100-----1.6kg/m3,,1/3,()A6kg/m3,B12kg/m3,C.4kg/m3,D2.,,,,_________.______.3.,()ABCD4.1kg,1kg()ABCD5.1m12m23V4:(1);2m13V4m25=.(1):21.:A.,,..,,,2/3,2/3:C2.:,,VVV.:V+V=V+V=V+VVVV.VVV.,VVV.V=0,V0,V0,.VVV.V0,V0,V0,.:,,.3.B.4.A5.:,,,,0,:,0100---1.A.B.C.D.2.,,m1:m2:m3=2:3:5,,()A.2:3:5B.5:3:2C.1:1:1D.15:10:63.7.9kg0.5m2________4.100N,20cm,10cm,_______5.3N20cm210cm,_______.6.PPA.PPB.P=PC.PPD7.1P1P1,2P2P2AP1P2P1P2BP1P2P1P2CP1P2P1P2DP1P2P1P28.,ABababA.ABB.BAC.D.1.:A:D2.AC,V=ghS.,G=F.P=F/S=G/S=ghS/S=gh,,C3.:158Pa.P=mg/s=(7.9kg10N/kg)/0.5m2=158Pa:7900PaV=m/=7.9kg/7.9103kg/m3=0.001m3,0.1m,S=0.01m2,,.S=0.01m2P=mg/s=(7.9kg10N/kg)/0.01m2=7900Pa4.:250Pa:1000Pa.(3)5.:3N.:2N,G=ghs=1103kg/m310N/kg0.1m2010-4m2=2N3N,.FG.,,P=gh=1000Pa,F=PS=1000Pa2010-4m2=2N6.:B.:C7.:B8.:Aab:C,ab..,,.1.()ABCD2.,,,,()ABC,D3.()ABCD4.,_________.5.,__________.6.,,,.,,',',()A)''B)'='=C)''D)''7.()ABCD8.,,()ABCD,9.,OS,,S',()ABCD10.,,_____().11.,A.B.C.D.12.()ABCD1.B2.C3.A4.5.,6.B7.D8.D9.B10.11.D12.BCQqtQ=cmDtQ=qm1A.B.C.D.[]2.4103/?0203.0107/B2010A.B.C.D.[]0BC1A.B.C.D.[]C1A.B.C.D.[]A2010A.B.C.D.[]00D3A.100B.C.50D.[]AB500DC4AB.C.D.[]Q=cm(tt0)t=Q/cm+t0Q=cm(tt0)t=t0Q/cmQmt0Qmt0BCD5u1=30u2=20u=10A.20B.1520C.10D.1015[]u12f302ffu22ff202fu3f10f10f15DA.B.C.D.A.B.C.D.________________________________________ttCCA.C=CB.CCC.CCD.6015A.90B.30C.45D.15A.B.C.D.u=5u=8A.u=4B.u=9C.u=14D.u=174050_________A.B.C.D.22050010044015230.01DCCBADBCD28CD0.87103/100---1.(ABCD2.,,,()A.B.C.,D.,3A.BCD,4.,,,,,()ABC,D5.:,,,;,,..A,3.D4.:A.,,,.B5.,..,,;,,.1.R=U/IABCD2.,10,1A,15,0.6A,,_______V.3.L1L2UP1P2,U,()A.,P1P2B.,P1P2C.PP2D.PP145..0.50kWh/24h24h.70W24hkWh.1.:ABD.,.:C2.:19V..U=101A+150.6A=19V:15V.1A0.6A.,,,0.6A,I=I=0.6AU=100.6A+150.6A=15V3.:D4,.:B,S,1.,2.2.1,,R2.,R1:R2=1:2.,S,1.,2.2,,R2,R1\R2.R1:R2=1:2,I1:I2=2:1.R23:1.5.0.5KW.h.1680KW.h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t=36J10S=3.6WPR=I2R=(U(RRL))2R=3.6WPLPR=(RRL)2RRL=40W3.6WRLR=91RLR=19PLPR=RLR=91PL=9PR=93.6W=32.4W32.48.PP[]PPP=U2/RPUR2/P=U2RPP=U2RU2R=(UU)2=()()UUUPPP22PPPP'()29.4.8R1.214R0.24[]P=I2RPPIRIRIILLLL''(')2214II'12RUIIILL4812..VARPIIR'.'2212WI=0.4APL=UI1=1.92W.10.3R1=10R2308R2R2[]R2RxPP=I2RP=I2Rx=(U(RxR1))2RxPRRRRRxxxxx()81064100202axbxca200,()=b24ac0RxPRPRPxx220641000()Rx=(20P64)24P100P0P1.6R21.6P=1.6Rx=101.48R1=20S1153A.R2=20B.R3=30C.0.1D.0.82.5LSPA.B.LC.D.3.10V4WRRRRUAA2A1V1V2V2V3U1625UUA.49B.94C.45D.544.RUtQ34RA.Ut34QB.UQ34tC.34Ut34QD.tQ34U1.BCD2.BD3.B4.BC1.2.20XX1________vZ______v()(1),vv(2)vv2F1F2F()AF1F2FBF1=F2F=0CF1F2F=F1-F2DFF1F2F1F2A31000.1220()A200B1000C800D200A20F120p1=F1/S1=120/0.12=1200p2=F2/S2=120/0.12=800C40.50.3()A0.3B0.2C0.5D0.4:(1)F=0.3(2)F0.30.5()0.3F0.5D5110()1/38()A2B6C8DG=10V=1/VF=8F=G-F=2F=gVg1/3V=2gV=66FGF10640~4A630027MN3ABBC()AABABCBCDCAABBABCBABAAAfBfABBCA8:6R210SI0.4R2R2=20SI()AI=0.2B0I0.2C0I0.4D0.2I0.4LR1R2R=R1+R2=R1+10U=IR=0.4R1+10R2R2R=R1+R2=R1+20RI0.4RRI0.29()ABCD10()ABCD1114R1R2123()AS2BS1/4CS3DS121215()ALBLCRDR1380100.82A100B4000C8000D3000014107ABCD15010A.B.C.D.[]0BC16A.B.C.D.[]A17010A.B.C.D.[]00D18CA.B.C.D.19ADA.B.C.D.20.()ABCD21FFAF=FBFFCFFD()12001/()A100B50C200D0250N100()A100JB50JC5000JD()3()ABCD4()ABCD()5()ABCD6()ABCD710000Pa150cm2g=10N/Kg1A.B.C.D.[]2.4103/?0203.0107/B2010A.B.C.D.[]0BC1A.B.C.D.[]C1A.B.C.D.[]A2010A.B.C.D.[]00D3A.100B.C.50D.[]AB500DC4A.B.C.D.[]Q=cm(tt0)t=Q/cm+t0Q=cm(tt0)t=t0Q/cmQmt0Qmt0BCD5u1=30u2=20u=10A.20B.1520C.10D.1015[]u12f302ffu22ff202fu3f10f10f15DA.B.C.D.A.B.C.D.________________________________________ttCCA.C=CB.CCC.CCD.6015A.90B.30C.45D.15A.B.C.D.u=5u=8A.u=4B.u=9C.u=14D.u=174050_________A.B.C.D.22050010044015230.011D2C31CBADBCD28CD0.87103/?DCCBADBCD28CD0.87103/?1ABCD2.4103J/kg0203.0107/B2010ABCABD0BA1ABCDC1ABCDA2010ABCD00D3A100BC50DAB500DC4130220310A20B1520C10D10151?302??22??202?3?10?10?15D[]1.2105mgBABCD23AABCD4100mL100mL200mL()56[C0).0CKgJ]7CABCD864g56g2.410-2Kg,410-5m39[C]ABCD10[D]ABCD11[C]ABCD12[A]ABCD13[B]ABCD1423234/523.15[B]A2104