锟斤拷锟斤拷锟絖锟斤拷锟酵勶拷(d锟斤拷ng)锟斤拷锟斤拷锟絇(gu锟斤拷n)系锟斤拷锟斤拷(d锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絯锟斤拷某锟斤拷(g锟斤拷)锟絩(sh锟斤拷)锟教碉拷锟斤拷锟斤拷p=mv锟斤拷v锟斤拷瞬锟絩(sh锟斤拷)锟劫度ｏ拷锟斤拷锟斤拷锟絖锟斤拷锟斤拷锟斤拷某锟轿時(sh锟斤拷)锟絞锟斤拷(n锟斤拷i)锟斤拷锟斤拷效锟斤拷锟斤拷i=ft锟斤拷锟斤拷锟揭傦拷锟斤拷锟斤拷锟絝(shu锟斤拷)锟斤拷某锟斤拷(g锟斤拷)锟絩(sh锟斤拷)锟教勶拷(d锟斤拷ng)锟斤拷锟斤拷小锟角讹拷锟斤拷锟斤拷锟斤拷某锟斤拷(g锟斤拷)锟絕(gu锟斤拷)锟斤拷锟斤拷某锟斤拷(g锟斤拷)锟斤拷锟斤拷锟剿讹拷锟斤拷?z锟斤拷ng)_锟斤拷锟斤拷锟揭傦拷锟斤拷锟斤拷锟紷锟接侊拷(l锟斤拷i)锟斤拷锟斤拷锟斤拷撸锟斤拷锟�(d锟斤拷ng)锟斤拷锟斤拷锟斤拷锟角勶拷(d锟斤拷ng)锟斤拷锟斤拷锟斤拷锟絖锟斤拷锟斤拷锟斤拷锟角癸拷锟斤拷

锟斤拷锟斤拷1锟絖锟斤拷锟酵勶拷(d锟斤拷ng)锟斤拷锟斤拷锟絇(gu锟斤拷n)系

锟斤拷锟斤拷锟斤拷(d锟斤拷ng)锟斤拷p锟斤拷mv,锟絖锟斤拷I锟斤拷锟斤拷Ft锟斤拷锟絇(gu锟斤拷n)系锟斤拷mv1-mv2=Ft锟斤拷

锟斤拷锟斤拷锟缴癸拷式锟斤拷锟斤拷锟斤拷锟斤拷锟揭�使锟給止锟斤拷锟斤拷锟絯锟紷锟斤拷一锟斤拷锟斤拷锟劫讹拷v锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟矫時(sh锟斤拷)锟絞锟酵讹拷锟斤拷锟斤拷小锟斤拷锟斤拷锟矫時(sh锟斤拷)锟絞锟斤拷锟絃(zh锟斤拷ng)一些锟斤拷锟斤拷锟酵時(sh锟斤拷)锟絞锟侥乘積锟节革拷變锟斤拷锟絯锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷B(t锟斤拷i)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锟斤拷锟斤拷锟絰锟斤拷锟斤拷锟絖锟斤拷锟斤拷F锟斤拷锟斤拷锟斤拷锟矫時(sh锟斤拷)锟絞t锟侥乘積锟斤拷锟斤拷锟斤拷锟斤拷锟侥沖锟斤拷锟斤拷锟斤拷I锟斤拷示锟絖锟斤拷锟斤拷I=Ft锟斤拷

锟斤拷锟斤拷锟絖锟斤拷锟斤拷锟斤拷锟侥時(sh锟斤拷)锟絞锟桔積效锟斤拷(y锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷矢锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷w锟斤拷锟杰碉拷锟斤拷锟角达拷小锟酵凤拷锟津都诧拷變锟侥猴拷锟斤拷F锟斤拷锟絖锟斤拷I锟斤拷锟斤拷F锟斤拷锟斤拷锟矫時(sh锟斤拷)锟絞t锟侥乘積锟斤拷锟斤拷锟紽锟侥达拷小锟斤拷锟斤拷锟斤拷锟斤拷變锟斤拷(d锟斤拷ng)锟斤拷锟斤拷锟絖锟斤拷I锟斤拷(y锟斤拷ng)锟斤拷矢锟斤拷锟絜锟斤拷锟絓(y锟斤拷n)锟斤拷锟斤拷

锟斤拷锟斤拷2锟絖锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)知锟絉(sh锟斤拷)锟絚(di锟斤拷n)

锟斤拷锟斤拷(1)I=Ft锟叫碉拷F锟斤拷锟斤拷锟�锟斤拷也锟斤拷锟斤拷锟斤拷榉斤拷锟阶冿拷锟阶冿拷锟斤拷跁r(sh锟斤拷)锟絞t锟斤拷(n锟斤拷i)锟斤拷平锟斤拷锟斤拷F锟斤拷锟斤拷锟斤拷锟斤拷拇锟叫�锟斤拷锟斤拷锟斤拷锟斤拷變锟斤拷锟斤拷锟斤拷锟絫锟斤拷锟斤拷锟斤拷Ft锟斤拷锟斤拷锟斤拷_锟斤拷锟斤拷變锟斤拷锟侥沖锟斤拷锟斤拷一锟斤拷锟絣锟斤拷锟铰匡拷锟斤拷锟絴(zh锟斤拷)锟絚(di锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷锟斤拷變锟斤拷锟絞锟接憋拷锟斤拷锟斤拷

锟斤拷锟斤拷(2)锟絖锟斤拷锟斤拷矢锟斤拷锟斤拷锟斤拷_锟斤拷锟斤拷锟紿要锟斤拷锟叫�锟斤拷還要锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絖锟斤拷锟侥凤拷锟斤拷锟絚锟斤拷锟斤拷同锟斤拷锟斤拷變锟斤拷锟絖锟斤拷锟侥凤拷锟斤拷锟絚锟斤拷(d锟斤拷ng)锟斤拷锟斤拷變锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷

锟斤拷锟斤拷(3)锟絖锟斤拷锟斤拷锟絕(gu锟斤拷)锟斤拷锟斤拷锟斤拷論锟斤拷锟絖锟斤拷锟絩(sh锟斤拷)要锟斤拷锟絖锟斤拷锟侥傦拷(g锟斤拷)锟斤拷锟斤拷锟侥幾傦拷(g锟斤拷)锟斤拷锟斤拷锟斤拷一锟轿時(sh锟斤拷)锟絞锟斤拷(n锟斤拷i)锟侥沖锟斤拷锟斤拷

锟斤拷锟斤拷(4)锟絖锟斤拷锟斤拷小只锟絈锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟矫的時(sh锟斤拷)锟絞锟斤拷锟斤拷锟絚锟斤拷锟絯锟角凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絯锟斤拷锟絓(y锟斤拷n)锟斤拷(d锟斤拷ng)锟斤拷B(t锟斤拷i)锟給(w锟斤拷)锟絇(gu锟斤拷n)锟斤拷

锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)锟斤拷锟絔锟斤拷

锟斤拷锟斤拷锟竭匡拷锟斤拷锟斤拷知锟絉(sh锟斤拷)锟絚(di锟斤拷n)锟絉锟斤拷

锟斤拷锟斤拷锟斤拷锟絖(d锟斤拷)锟斤拷效锟斤拷(y锟斤拷ng)锟斤拷什么锟紽(xi锟斤拷n)锟斤拷锟斤拷锟斤拷些锟斤拷(y锟斤拷ng)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斤拷(zh锟斤拷n)锟斤拷锟斤拷志愿锟斤拷锟�(b锟斤拷o)锟斤拷锟饺★拷锟�?j锟斤拷n)?sh锟斤拷)锟斤拷锟斤拷

锟竭匡拷锟絩(sh锟斤拷)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(di锟斤拷n)

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(h锟斤拷o)