初中物理专题：力学练习题含答案

1ABCDC123AABBCCDDC2A.B.C.D.AAG=mg.3A.B.C.D.CABDCC.4mA.mgB.C.D.AAmgmgABBCCDDA.5A.B.C.D.CAABBCCDDABCDC6A.B.C.D.CAABBCCDDC7200963054A.B.C.D.B1234ABCDB123481N2NA.B.C.1N2ND.1N2NB1N2N2NB9A.B.C.D.AF=G-FAF=G-F.B.CDA10A.F3B.F4F1C.F2D.F1F3F1=F3D4F3AF4F1F1BF2CF1F3D110.5m/sFtg=10N/kgA.140kgB.500NC.1.8103kg/m3D.2.8104PaDAF=G=1400Nm===140kgABF=900NF=G-F=1400N-900N=500NBCV=V======CDt=4s-2s=2sv=0.5m/sh=vt=0.5m/s2s=1mP====hgDDAm=BF=G-FCDP=125NA.00B.05NC.5N5ND.010NB05N5NB13ACDCEOAOB1CDOB2CEOB3CDOB4CEAAOB1BOB2COB3DOB4BOB2B14A.B.C.D.BAABBCCDDB.15ABCDC12AABBCCDDC16ABCDDABCDD17ABCDBAABBCCDDB18ABCDBAABBCCDD195000NA2500NB5000NC0D1000NB5000N5000N5000NBB20,A6NB60NC600ND6000NC60kg6010/600GmgkgNkgN600N600NABDCC21GFABCDBBB.22OAOAOBABCDCA.AB.BC.CD.DC23ABCDDAABDDBCCD24ABCDDAABBCCDD25ABCDBABCD26ABAB100N/m2cm3NB5NAB100N/m100N1mA5N3NB7N3NC1N5ND1N7NA100N/m0.02m2NFkxAFFAGAFFG2N3N5NAGBBGFFBFGF5N2N3NBGA27G1G2G3A23GGB32GGC2131GGGGD3121GGGGDmV21mGGGVgg31312121mGGGGGGGVgVGGgg,D28ABCDBABCD295t=1500kgCD50kgDD30A28dmB150NC1m/sD37C10cm26cmA50kgG=mg=50kg10N/kg=500NB1m/sC3725DC