锟斤拷锟斤拷锟斤拷車锟紻(zhu锟斤拷n)锟斤拷锟斤拷x車锟斤拷全锟斤拷锟絣锟斤拷锟斤拷

锟斤拷锟斤拷一锟絭锟斤拷車锟节岋拷闊碉拷路锟斤拷锟斤拷锟�锟斤拷前锟斤拷突然锟斤拷锟紽(xi锟斤拷n)锟斤拷锟饺很达拷锟斤拷系K锟斤拷锟斤拷锟斤拷锟剿憋拷锟斤拷锟斤拷撞锟斤拷試锟斤拷該車锟絰锟今急剎車锟斤拷锟斤拷還锟斤拷锟斤拷原锟劫硷拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷锟斤拷

锟斤拷锟斤拷?之一锟斤拷?一锟斤拷锟斤拷锟斤拷锟斤拷锟�1锟斤拷锟斤拷锟斤拷锟矫硷拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷式锟斤拷锟絫锟斤拷車锟杰碉拷锟斤拷摩锟斤拷锟斤拷锟结供锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷使锟斤拷車锟斤拷水平路锟斤拷锟斤拷锟斤拷锟斤拷锟劫圓锟斤拷锟絓锟接★拷锟絆(sh锟斤拷)锟斤拷锟斤拷o摩锟斤拷锟斤拷锟斤拷锟节伙拷锟斤拷摩锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷(j锟斤拷)锟斤拷锟斤拷锟斤拷锟斤拷式锟斤拷f=mv锟斤拷锟斤拷R锟斤拷锟斤拷锟斤拷(j锟斤拷)摩锟斤拷锟斤拷锟斤拷式f=μΝ=μmg,锟斤拷之锟矫ｏ拷R=v锟斤拷锟斤拷μg锟斤拷

锟斤拷锟斤拷?锟斤拷2锟斤拷锟斤拷锟斤拷锟矫硷拷锟絰車锟侥凤拷式锟斤拷锟絫锟斤拷锟絵锟斤拷锟街�锟斤拷锟斤拷車锟斤拷水平锟斤拷锟斤拷锟杰伙拷锟斤拷摩锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟絈直锟斤拷锟斤拷锟杰碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷支锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷平锟解，锟斤拷锟斤拷锟剿�平锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷直锟斤拷锟絓锟接ｏ拷锟斤拷锟斤拷(j锟斤拷)牛锟紻锟斤拷锟斤拷锟絓锟接讹拷锟缴ｏ拷f=ma锟斤拷锟斤拷锟斤拷(j锟斤拷)摩锟斤拷锟斤拷锟斤拷式f=μΝ=μmg锟矫硷拷锟劫度的达拷小锟介：a=μg锟斤拷

锟斤拷锟斤拷??锟斤拷锟斤拷(j锟斤拷)锟絓锟接學(xu锟斤拷)vt2-v2=2as锟斤拷式,锟斤拷锟絰車锟絩末锟劫度烇拷0锟斤拷锟矫筹拷锟斤拷車锟斤拷锟叫撅拷锟絰锟介：s=v锟斤拷锟斤拷2a=v锟斤拷锟斤拷2μg锟斤拷

锟斤拷锟斤拷??锟斤拷锟絕锟斤拷锟斤拷s锟斤拷R锟斤拷小锟侥憋拷示式锟斤拷锟皆匡拷锟斤拷锟斤拷锟斤拷(d锟斤拷ng)锟斤拷車锟斤拷锟劫讹拷v一锟斤拷锟斤拷锟斤拷锟较礙锟斤拷锟斤拷x一锟斤拷锟絩锟斤拷s小锟斤拷R锟斤拷锟斤拷锟斤拷锟矫硷拷锟絰車锟斤拷锟斤拷锟斤拷锟叫撅拷锟絰锟教ｏ拷锟斤拷锟斤拷锟斤拷锟斤拷@锟絅锟斤拷式锟絕锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷锟紿锟絳(di锟斤拷o)锟介：通锟絕锟絳(di锟斤拷o)锟斤拷锟节岋拷锟紿锟斤拷通锟斤拷見锟斤拷锟斤拷車锟斤拷锟斤拷锟斤拷薪锟�(j锟斤拷ng)锟斤拷司锟紺锟絝锟斤拷锟給锟斤拷锟斤拷锟経锟絩锟斤拷锟斤拷锟絰車锟斤拷锟竭硷拷锟紻(zhu锟斤拷n)锟斤拷锟叫時锟斤拷锟斤拷锟斤拷锟経锟斤拷锟斤拷也锟叫時锟斤拷锟斤拷锟経锟斤拷锟紷锟角烇拷什么锟斤拷

锟斤拷锟斤拷之锟斤拷锟斤拷聯(li锟斤拷n)系锟斤拷锟紿锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟解法一锟斤拷一锟斤拷锟斤拷锟斤拷锟斤拷钥锟斤拷锟斤拷锟斤拷_锟斤拷锟斤拷锟斤拷锟斤拷一锟斤拷锟斤拷缺锟斤拷锟斤拷锟斤拷視锟斤拷锟絵目锟叫的條锟斤拷锟斤拷锟斤拷锟斤拷锟絵锟斤拷始锟終锟絔锟叫匡拷锟絔锟较礙锟斤拷膶锟斤拷却锟叫★拷锟斤拷锟杰囷拷x锟较礙锟斤拷木锟斤拷x锟斤拷锟劫讹拷锟斤拷車锟絰锟较礙锟斤拷木锟斤拷x锟斤拷L锟斤拷锟斤拷锟斤拷(j锟斤拷)锟斤拷锟斤拷慕Y(ji锟斤拷)論锟斤拷司锟紺锟斤拷锟絰車锟絩锟斤拷s=v锟斤拷锟斤拷锟斤拷μg锟斤拷司锟紺锟斤拷锟紻(zhu锟斤拷n)锟斤拷锟絩锟斤拷R=v锟斤拷锟斤拷μg锟斤拷锟矫筹拷锟斤拷锟斤拷討論锟結(ji锟斤拷)锟斤拷锟斤拷

锟斤拷锟斤拷锟斤拷1锟斤拷锟斤拷(d锟斤拷ng)L锟斤拷R锟絩锟斤拷锟絫锟斤拷锟絰車锟斤拷锟竭硷拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷锟斤拷

锟斤拷锟�锟斤拷锟�2锟斤拷锟斤拷(d锟斤拷ng)s锟斤拷L锟斤拷R锟絩锟斤拷锟絫锟斤拷锟絰車锟斤拷锟経锟斤拷

锟斤拷锟�锟斤拷锟�3锟斤拷锟斤拷(d锟斤拷ng)L锟斤拷s锟絩锟斤拷锟給锟斤拷锟絰車锟紷然锟斤拷锟缴ｏ拷锟斤拷锟斤拷锟杰凤拷全锟紻(zhu锟斤拷n)锟斤拷锟斤拷視锟较礙锟斤拷膶锟斤拷燃锟轿伙拷貌锟斤拷軟Q锟斤拷锟斤拷锟斤拷锟较礙锟斤不論锟斤拷锟叫★拷锟轿伙拷锟斤拷锟斤拷锟杰囷拷锟斤拷A锟斤拷锟絓锟接的半徑之锟斤拷(n锟斤拷i)锟斤拷锟絫锟斤拷锟杰硷拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷锟斤拷锟较礙锟斤拷位锟斤拷锟斤拷锟紻(zhu锟斤拷n)锟斤拷锟诫徑之锟斤拷锟斤拷锟絫锟斤拷锟皆硷拷锟紻(zhu锟斤拷n)锟斤拷锟斤拷