锟斤拷锟斤拷1.锟斤拷锟斤拷g=mg(锟斤拷锟斤拷锟絈直锟斤拷锟斤拷锟斤拷g=9.8m/s2≈10m/s2锟斤拷锟斤拷锟斤拷锟絚锟斤拷锟斤拷锟侥ｏ拷锟絤锟斤拷锟节碉拷锟斤拷锟斤拷娓斤拷锟�)

锟斤拷锟斤拷2.锟斤拷锟剿讹拷锟斤拷f=kx{锟斤拷锟斤拷锟截恢忥拷锟斤拷變锟斤拷锟斤拷锟斤拷k锟斤拷锟脚讹拷系锟斤拷(sh锟斤拷)(n/m)锟斤拷x锟斤拷锟斤拷變锟斤拷(m)锟斤拷

锟斤拷锟斤拷3.锟斤拷锟斤拷摩锟斤拷锟斤拷f=μfn{锟絚锟斤拷锟絯锟斤拷锟斤拷锟絓锟接凤拷锟斤拷锟洁反锟斤拷μ锟斤拷摩锟斤拷锟斤拷(sh锟斤拷)锟斤拷fn锟斤拷锟斤拷锟斤拷锟斤拷(n)锟斤拷

锟斤拷锟斤拷4.锟給摩锟斤拷锟斤拷0≤f锟給≤fm(锟絚锟斤拷锟絯锟斤拷锟斤拷锟絓锟斤拷趨锟捷凤拷锟斤拷锟洁反锟斤拷fm锟斤拷锟斤拷锟斤拷o摩锟斤拷锟斤拷)

锟斤拷锟斤拷5.锟絝锟斤拷锟斤拷锟斤拷f=gm1m2/r2(g=6.67×10-11n?m2/kg2,锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟紹锟斤拷锟斤拷)

锟斤拷锟斤拷6.牛锟紻锟斤拷一锟絓锟接讹拷锟斤拷(锟絋锟皆讹拷锟斤拷)锟斤拷锟斤拷锟絯锟斤拷锟叫慣锟斤拷锟斤拷锟斤拷锟斤拷锟街勶拷锟斤拷直锟斤拷锟絓锟接狅拷B(t锟斤拷i)锟斤拷锟給止锟斤拷B(t锟斤拷i),直锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷使锟斤拷锟斤拷變锟紷锟絅锟斤拷B(t锟斤拷i)锟斤拷止

锟斤拷锟斤拷7.牛锟紻锟节讹拷锟絓锟接讹拷锟缴ｏ拷f锟斤拷=ma锟斤拷a=f锟斤拷/ma{锟缴猴拷锟斤拷锟斤拷锟絈锟斤拷,锟絚锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷}

锟斤拷锟斤拷8.牛锟紻锟斤拷锟斤拷锟絓锟接讹拷锟缴ｏ拷f=-f′{負號锟斤拷示锟斤拷锟斤拷锟洁反,f锟斤拷f′锟斤拷锟斤拷锟斤拷锟斤拷锟节岋拷锟斤拷锟斤拷平锟斤拷锟斤拷锟絚锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絕(q锟斤拷)锟絜锟斤拷锟斤拷锟紿锟斤拷锟矫ｏ拷锟斤拷锟絖锟絓锟斤拷}

锟斤拷锟斤拷9.锟斤拷锟絚锟斤拷锟斤拷平锟斤拷f锟斤拷=0锟斤拷锟狡廣{锟斤拷锟斤拷锟街解法锟斤拷锟斤拷锟斤拷锟絉锟斤拷原锟斤拷锟斤拷

锟斤拷锟斤拷10.锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷wab=mghab{m:锟斤拷锟絯锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷g=9.8m/s2≈10m/s2锟斤拷hab锟斤拷a锟絚b锟竭度诧拷(hab=ha-hb)}

锟斤拷锟斤拷11.锟斤拷锟杰ｏ拷ek=mv2/2{ek:锟斤拷锟斤拷(j)锟斤拷m锟斤拷锟斤拷锟絯锟絴(zh锟斤拷)锟斤拷(kg)锟斤拷v:锟斤拷锟絯瞬锟絩锟劫讹拷(m/s)锟斤拷

锟斤拷锟斤拷12.锟斤拷锟斤拷锟斤拷锟杰ｏ拷ep=mgh{ep:锟斤拷锟斤拷锟斤拷锟斤拷(j)锟斤拷g:锟斤拷锟斤拷锟斤拷锟劫讹拷锟斤拷h:锟絈直锟竭讹拷(m)(锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟�)锟斤拷

锟斤拷锟斤拷13.電癸拷锟斤拷w=uit(锟斤拷锟絤式){u锟斤拷電夛拷(v)锟斤拷i:锟斤拷锟�(a)锟斤拷t:通電時锟絞(s)锟斤拷

锟斤拷锟斤拷14.锟斤拷锟斤拷锟斤拷锟缴ｏ拷q=i2rt {q:電燂拷(j)锟斤拷i:锟斤拷锟斤拷锟斤拷锟�(a)锟斤拷r:锟斤拷锟街�(ω)锟斤拷t:通電時锟絞(s)锟斤拷

锟斤拷锟斤拷15.锟斤拷锟杰讹拷锟斤拷(锟斤拷锟斤拷锟絯锟斤拷锟斤拷锟斤拷,锟斤拷锟絯锟侥勶拷锟斤拷锟斤拷锟斤拷)锟斤拷w锟斤拷=mvt2/2-mvo2/2锟斤拷w锟斤拷=δek{w锟斤拷:锟斤拷锟斤拷锟斤拷锟斤拷锟絯锟斤拷锟侥匡拷锟斤拷锟斤拷δek:锟斤拷锟斤拷變锟斤拷δek=(mvt2/2-mvo2/2)锟斤拷

锟斤拷锟絇锟斤拷锟絔锟斤拷

       锟竭讹拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷R锟斤拷

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟斤拷锟斤拷锟斤拷前锟绞傦拷锟斤拷志愿锟斤拷锟�锟斤拷锟饺★拷謹锟�(sh锟斤拷)锟斤拷锟斤拷

锟竭匡拷锟絩锟絞锟斤拷锟斤拷全锟斤拷锟斤拷要锟斤拷(ji锟斤拷)锟絚

锟組锟斤拷"锟竭匡拷锟絎(w锟斤拷ng)"微锟脚癸拷锟斤拷號