(完整)人教版八年级物理计算公式汇总(完整),推荐文档

1、人教版八年级物理计算公式归纳(完整版)公式分类基本公式推导公式单位注意事项速度（v）v = sts = vtt = svsm(米) t s（秒）v m/s（米每秒）1m/s=3.6km/h1h=3600s1min=60s密度()h= mvm = hvh= mvmg(千克)vm3（立方米）kg/m3（千克每立方米）1t=1000kg，1kg=1000g，1g=1000mg 1 g/cm3=1000 kg/m31m3=1106cm31cm3=1ml1dm3=1l=1000ml重力(g)g = mgm = gggn(牛)mkg（千克）10n/kgf=g=mg（物体水平放置时）f = psppa(帕)

2、f（牛）大气压力、压强：1 标准大气压强 p0=760mmhg=1.013105pa固体压力、压强p = fss = fpsm（平方米）（米）大气压力 f= p0 s1m2 =1104 cm2p液 = hgh液体密度h= p液ghp液液体深度 h = hgg/m3（千克每立方1cm2=110-4m2液体压强、压力米）1pa= 1n/m2f = ps公式分类基本公式推导公式单位注意事项阿基米德：f浮 = g排 = h液v排ghf 浮 液 =v排gvf浮排 = h g液 液 g/m3浸没时： v物排= v（必须牢记）（千克每立方米）漂浮悬浮时： f浮 = g =mg浮力（）f浮 = f向上 - f

3、向下f 浮（牛）排m3（立方米）1m3=1106cm31 cm3=110-6 m3f浮 = g - f示1dm3=110-3m3漂浮或悬浮f浮 = g =mg功（w）水平：w = fsf = wss = wf (焦耳)（牛）s m（米）1n m =1 j竖直：w=gh=mh功率（）p = wtt = wpw = pt (焦耳)pw（瓦特）ts（秒）1 w=1j/s；1kw=1000 wp = fv p = =t = fv tf = pvv = pf杠杆平衡条件f1l1 = f 2l 2f 1 = f 2l 2 l1f 2 = f 1l1l 2l1 = f 2l 2f 1l 2 = f 1l1f

4、 2f-n(牛)l -m(米)h= w有用w总滑轮h= w 有 用 = gh = gh w总fsfnh (焦耳)g（牛） （牛）定滑轮： f=gs=h（g 为物体重力）动滑轮：f=1/2(g+g 轮)或 1/2g s=2h滑轮组： f=1/n（g 物+g 轮）s=nh有用功：w 有=gh额外功：w 额=g 轮h (g 轮为滑轮自身的重力)w 额=f s （ f 为斜面所受摩擦力）总功w 总=fsw 总=w 有+w 额n 为动滑轮上绳子的股数机械效率（）机械效率总是斜面h= w有用 = ghw总fssm（米） （米）小于 1“”“”at the end, xiao bian gives you

5、a passage. minand once said, people who learn to learn are very happy people. in every wonderful life, learning is an eternal theme. as a professional clerical and teaching position, i understand the importance of continuous learning, life is diligent, nothing can be gained, only continuous learning can achieve better self. only by constantly learning and mastering the latest relevant knowledge, can employees from all walks of life keep up with the pace of enterprise development and innovate to meet the needs of the market. this document is also edited by my studio profes