锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟角勶拷锟斤拷锟絎锟斤拷锟秸遍定锟斤拷之一锟斤拷锟斤拷(n锟斤拷i)锟捷烇拷锟斤拷锟絯锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟杰猴拷锟斤拷锟斤拷锟侥沖锟斤拷锟斤拷Ft=mΔv锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟侥沖锟斤拷锟斤拷矢锟斤拷锟酵★拷

锟斤拷锟斤拷1锟斤拷锟斤拷锟斤拷锟斤拷锟絤锟矫條锟斤拷

锟斤拷锟�锟斤拷锟�1锟斤拷系锟統(t锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷系锟統(t锟斤拷ng)锟斤拷锟杰碉拷锟斤拷锟斤拷锟侥猴拷锟斤拷锟斤拷锟姐。

锟斤拷锟�锟斤拷锟�2锟斤拷系锟統(t锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟侥猴拷锟斤拷锟絤锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷系锟統(t锟斤拷ng)锟斤拷(n锟斤拷i)锟斤拷小锟矫讹拷锟斤拷

锟斤拷锟�锟斤拷锟�3锟斤拷系锟統(t锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷锟侥猴拷锟斤拷锟絤锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷某锟斤拷锟斤拷锟斤拷锟较的凤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絫锟斤拷該锟斤拷锟斤拷锟斤拷系锟統(t锟斤拷ng)锟侥匡拷锟斤拷锟斤拷锟斤拷锟街诧拷變——锟街勶拷锟斤拷锟截猴拷锟斤拷

锟斤拷锟斤拷注锟解：(1)锟絕(q锟斤拷)锟街冿拷(n锟斤拷i)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷撞锟絩锟缴傦拷锟斤拷锟絯之锟絞一锟斤拷锟斤拷锟洁互锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟紷锟缴傦拷锟斤拷锟絯锟角岋拷锟斤拷同一锟斤拷系锟統(t锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷之锟絞锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷(n锟斤拷i)锟斤拷锟斤拷系锟統(t锟斤拷ng)锟斤拷锟斤拷锟斤拷锟斤拷w施锟接碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷(2)锟节匡拷锟斤拷锟斤拷一锟斤拷锟斤拷锟斤拷r锟斤拷锟斤拷每锟斤拷锟斤拷锟絯锟侥勶拷锟斤拷锟斤拷锟皆發(f锟斤拷)锟斤拷锟杰达拷變锟斤拷锟斤拷锟界：锟給止锟侥冿拷锟絭小車锟矫硷拷锟斤拷锟斤拷锟紹锟斤拷锟斤拷锟絞锟斤拷一锟斤拷锟斤拷锟絪锟侥忥拷锟斤拷锟斤拷锟斤拷锟洁細锟斤拷锟斤拷锟斤拷锟斤拷锟节忥拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絭小車锟街別锟斤拷锟斤拷锟斤拷锟絓锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟紷锟斤拷锟剿勶拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷矢锟斤拷锟酵烇拷锟斤拷锟斤拷

锟斤拷锟斤拷2锟斤拷锟斤拷锟斤拷锟缴的戯拷锟斤拷

锟斤拷锟斤拷锟矫勶拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷械默F(xi锟斤拷n)锟斤拷

锟斤拷锟斤拷锟絈锟斤拷锟斤拷锟矫的粉筆锟斤拷锟节硷拷锟絣锟斤拷一锟斤拷.要锟斤拷鸭锟斤拷l锟侥粉筆锟铰筹拷锟�锟斤拷锟斤拷要锟斤拷锟紺锟桔筆锟斤拷锟斤拷锟斤拷锟斤拷該锟斤拷锟斤拷锟斤拷小锟侥地岋拷锟斤拷锟絣锟斤拷锟斤拷锟竭�锟角匡拷锟劫岋拷锟斤拷锟絣锟斤拷锟�?锟絝锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷[锟斤拷锟斤拷]锟斤拷锟絣锟侥粉筆锟铰筹拷锟斤拷锟斤拷酃P锟杰碉拷锟斤拷锟絣锟斤拷锟斤拷锟侥伙拷锟斤拷摩锟斤拷锟斤拷μmg锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絣锟斤拷锟斤拷姆锟斤拷颉２锟秸擄拷锟斤拷l锟角匡拷锟劫筹拷锟�锟斤拷還锟角撅拷锟斤拷锟斤拷锟斤拷锟斤拷酃P锟斤拷水平锟斤拷锟斤拷锟杰碉拷锟斤拷摩锟斤拷锟斤拷锟侥达拷小锟斤拷變.锟节硷拷锟絣锟斤拷锟斤拷^锟斤拷锟斤拷锟斤拷锟桔筆锟杰碉拷摩锟斤拷锟斤拷锟斤拷锟斤拷锟矫時锟絞锟斤拷t锟斤拷示锟斤拷锟桔筆锟杰碉拷摩锟斤拷锟斤拷锟侥沖锟斤拷锟斤拷μmgt锟斤拷锟桔筆原锟斤拷锟給止锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟桔筆锟斤拷末锟斤拷锟斤拷锟斤拷mv锟斤拷示.锟斤拷锟斤拷(j锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷:μmgt=mv锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絣锟斤拷锟斤拷锟絣锟斤拷锟桔筆锟斤拷锟斤拷锟矫時锟絞锟斤拷锟絕锟絃锟斤拷锟桔筆锟杰碉拷锟斤拷锟絣锟斤拷锟斤拷摩锟斤拷锟斤拷锟侥沖锟斤拷锟酵憋拷锟絕锟斤拷锟斤拷锟桔筆锟斤拷锟斤拷锟侥革拷變也锟斤拷锟絕锟斤拷锟斤拷锟桔筆锟侥底端就獲锟斤拷锟斤拷一锟斤拷锟斤拷锟劫讹拷.锟斤拷锟节慣锟斤拷锟斤拷锟桔筆锟较讹拷還锟絔锟叫侊拷锟矫硷拷锟絓锟接ｏ拷锟桔筆锟酵碉拷锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟斤拷跇O锟教的時锟絞锟斤拷(n锟斤拷i)锟窖硷拷锟絣锟斤拷锟�锟斤拷锟斤拷锟絣锟斤拷锟桔筆锟斤拷摩锟斤拷锟斤拷锟絖锟斤拷锟絆小锟斤拷锟桔筆锟侥勶拷锟斤拷锟阶猴拷锟斤拷變锟斤拷锟桔筆锟侥勶拷锟斤拷锟斤拷變锟矫極小锟斤拷锟桔筆锟阶猴拷锟斤拷锟接ｏ拷锟桔筆也锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷锟矫勶拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絓锟接嗭拷锟絵

锟斤拷锟斤拷锟斤拷锟劫讹拷v0水平锟斤拷锟斤拷一锟斤拷锟絴(zh锟斤拷)锟斤拷锟斤拷1 kg锟斤拷锟斤拷锟絯锟斤拷锟斤拷锟节掞拷锟斤拷锟斤拷5 s未锟斤拷锟斤拷锟轿达拷c锟斤拷锟斤拷锟斤拷锟絯锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷5 s锟斤拷(n锟斤拷i)锟侥勶拷锟斤拷锟斤拷變锟斤拷.(g=10 m/s2)锟斤拷

锟斤拷锟斤拷[锟斤拷锟斤拷]锟斤拷锟絵锟斤拷锟斤拷锟侥╋拷锟斤拷锟�锟斤拷锟斤拷锟斤拷锟斤拷锟絚锟斤拷锟斤拷锟斤拷锟斤拷矢锟斤拷锟斤拷锟斤拷锟絫锟絆锟介繁锟斤拷锟斤拷锟斤拷锟斤拷平锟斤拷锟斤拷去锟斤拷锟斤拷锟絯只锟斤拷锟斤拷锟斤拷锟揭烇拷锟斤拷锟�锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟阶冿拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷臎_锟斤拷锟斤拷

锟斤拷锟斤拷锟絫

锟斤拷锟斤拷Δp=Ft=mgt=1×10×5=50 kg·m/s锟斤拷

锟斤拷锟斤拷[锟絚锟絬]锟斤拷锟絓锟斤拷Δp=mv-mv0锟斤拷Δp锟絩锟斤拷锟斤拷锟斤拷末锟劫度憋拷锟斤拷锟酵�一直锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷同一直锟斤拷锟斤拷锟借考锟絔锟絓锟斤拷矢锟斤拷锟斤拷锟絫锟斤拷锟斤拷锟斤拷锟斤拷锟�Δp=Ft锟斤拷锟�Δp.锟斤拷锟斤拷I=F·t锟斤拷_锟斤拷锟斤拷F(xi锟斤拷n)锟斤拷锟斤拷呛锟斤拷锟斤拷锟斤拷锟紽锟斤拷變锟斤拷锟斤拷锟斤拷锟矫勶拷锟斤拷锟斤拷锟斤拷I=Δp锟斤拷锟絀锟斤拷

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锟絚锟絉锟斤拷

锟斤拷锟斤拷摩锟斤拷锟斤拷锟侥达拷小锟絚锟斤拷些锟斤拷锟斤拷锟斤拷锟絇(gu锟斤拷n)?

锟斤拷锟铰高匡拷锟結訊锟斤拷锟竭匡拷锟斤拷锟竭★拷锟斤拷前锟绞傦拷锟斤拷志愿锟斤拷锟斤拷取锟街旓拷(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