YI、QUWEIWENTI
一根长 1m 左右的空心铝管竖直放置（见图 1甲），把一枚磁性很强的小圆柱型永磁体从铝管上端放入管口，圆柱直径略小于铝管的内径。根据一般经验，小圆柱自由落下 1m 左右的时间不会超过 0.5s，但把小圆柱从上端管口放入管中后，过了许久它才从铝管下端落出。小圆柱在管内运动时，没有感觉到它跟铝管内壁发生摩擦，把小圆柱靠着铝管，也不见它们相互吸引。是什么原因使小圆柱在铝管中缓慢下落呢？如果换用一条有裂缝的铝管（见图 1乙），圆柱在铝管中的下落就变快了，这又是为什么？”。
ER、QIANGCITIZAILVGUANZHONGXIALUOGUOCHENGDESHIYANXIANXIANG
1、CIJIZHOUXIANGFENBUDEQIANGCITIXIALUODEXIANXIANG
RUTU 2 SUOSHI，JIANGZHANGDU 1.60m，NEIJING 12mm，WAIJING 15mm DEZITONGGUANSHUZHIFANGZHI，YONGNVTIEPENGCAILIAOZHICHENGDEYUANZHUXINGCIJIZAIZHOUXIANGFENBUDECITI（ZHIJING 10mm，GAODU 60mm）CONGGUANNEIWUCHUSUSHIFANG，DAYUEJINGGUO 8s CITICAICONGGUANDEXIADUANLUOCHU。
2、CIJIZAISHUIPINGFANGXIANGDEQIANGCITIXIALUODEXIANXIANG
RUTU 3 SUOSHI，RUOJIANGZHANGDU、KUANDU、HOUDUFENBIESHI 40mm、10mm、3mm DECIPIANCONGSHANGSHU
ZHIGUANZHONGXIALUO，DAYUEJINGGUO 2sCITIJIUCONGGUANDEXIADUANLUOCHU。
SAN、 DUISHIYANXIANXIANGDETANJIU：
1、DUICIJIZHOUXIANGFENBUDEQIANGCITIXIALUOXIANXIANGDEJIESHI
（1）DINGXINGSHUOMING
GUANZIJIAOZHANGSHI，CITIEZAIGUANZHONGXIALUOYIDINGJULIHOU，CITIESHANG、XIAFANGDECITONGLIANGJUNKEYISHIWEIBUBIAN，GENJUFALADIDIANCIGANYINGDINGLV，GUANNEIDEZONGDIANDONGSHIWEILING，GUANNEIDEWOLIUSHIZENYANGXINGCHENGDENI？
RUOJIANGCITIKANCHENGBUDONG，GUANZIXIANGDUIYUCITIXIANGSHANGYUNDONG，YOUYUCUNZAICIGANYINGQIANGDUYANBANJINGFANGXIANGDEFENLIANG，GUANZIZAIZUOQIEGECIGANXIANYUNDONG，YOUYOUSHOUDINGZEKEYIDECHU，CITIESHANGXIAGUANZIZHONGDEWOLIUFANGXIANGXIANGFAN。CITIESHANGMIANBUFENGUANZHONGDEWOLIUXIANGDANGYUSHANGMIANSHI N JI，XIAMIANSHI S JIDECITI；CITIEXIAMIANBUFENGUANZHONGDEWOLIUXIANGDANGYUSHANGMIANSHI S JI，XIAMIANSHI N JIDECITI，JUTIJIESHIJIANTU 4。
SHANGSHUFENXIGAOSUWOMEN，YOUYUGUANZIDEWOLIUDUIYUANZHUXINGCITIDEZUOYONGSHI“SHANGLAXIADING”，SUOYIXINGCHENGDUIQIYUNDONGGUOCHENGDEZULI。
（2）DINGLIANGJIESHI
YOUYUGUANZIDESUOYOUBUFENYIXIANGTONGDESUDUZUOQIEGECIGANXIANYUNDONG，SUOYIGUANZIDERENYIBUFENDOUSHIDIANYUAN。GUANZIZHONGZHANGDUWEI L （JIANTU 5）DERENYIXIAODUANYANYUANZHOURAOXINGYIZHOUDEDONGSHENGDIANDONGSHI，DENGYUYANYUANZHOURAOXINGYIZHOUDEDIANYAJIANGZHIHE。GUANZHONGRENYILIANGDIANJIANDEDIANYAWEILING。
XIANJISUANZHANGWEI L ，NEIBANJINGWEI r1 ，WAIBANJINGWEI r2DEYIDUANZHIGUANYANYUANZHOURAOXINGYIZHOUDEDIANZUR L 。LIZHOUXIN r CHU，JIEMIANWEI △L ·△r YANYUANZHOURAOXINGYIZHOUDEDIANZUDEDAOSHUWEI：
YOUYUr2 LVEDAYU r1 ，KEYIRENWEIZAIGUANBINEIXIANGDUIYUCITIDEMOUCHUCIGANYINGQIANGDUYANJINGXIANGDEBUTONGWEIZHI，DAXIAOXIANGTONG。DANGGUANZIYUCITIEDEXIANGDUISUDUDAXIAOWEI v SHI，HULVE r1 HE r2 DECHABIE。
QIWULIHANYISHIGUANZIKAOJINCIJIFUJINDEWOLIUJIAOQIANG，LICIJIJIAOYUANDEBUFENWOLIUHENRUO，GUANZIKAOJINCIJIFUJINDEWOLIUDUICITIDEDIANCILIQIZHUYAOZUOYONG。SHANGXIAWOLIUFANZUOYONGYUCIJIXINGCHENGDUIYUNDONGCITIDEZULI。
ZUOWEIGUSUANSHANGSHUFANGFADECHUSHOUWEISUDUHESHIYANQINGXINGSHIWENHEDE，BIZHEHEXUESHENGFENBIEYONGZHANGDU
FENBIESHI 1m、 1.6m、 2m、 6m（ZAIHUWAI）DELVGUANZUOSHIYAN，CITIEZAIGUANZHONGXIALUOBUDAO 20cm，
SHOUWOZHIGUANDELIJIUBUZAIBIANHUA，SHUOMINGCIHOUCITIEZUOYUNSUYUNDONG。CELIANGCITIEZAIGUANZHONGDEYUNDONGSHI
JIAN，DECHUCITIEYUNSUXIALUODESUDUDOUZAI 20cm/s ZUOYOU。
2、 DUICIJIZAISHUIPINGFANGXIANGDEQIANGCITIXIALUOXIANXIANGDEJIESHI
（ 1）DAOTIBANYUCICHANGXIANGDUIYUNDONGSHIDEANPEILIJISUAN
RUTU 6 SUOSHI，DANGDAOTIBANXIANGDUICICHANGXIANGZUOYUNDONGSHI，JIANGCHUANGUODAOTIBANDECIGANYINGXIANKANCHENGJUN
YUN。JIASHECITIEHEDAOTIBANDEXIANGDUIYUNDONGSUDUDAXIAOWEI v，DAOTIBANZAICICHANGZHONGDEJIHECHICUNYEBIAOZAI
TUSHANG，RUTU 7 SUOSHI。DAOTIBANDEGANYINGDIANDONGSHIDAXIAOWEI：
3、CITIEZAIYOULIEFENGDELVGUANZHONGXIALUOJIAOKUAIDEYUANYINFENXI
YOUYUGUANZIZHENGTIXIANGDUIYUCITIZUOQIEGECIGANXIANYUNDONG，GUANYUCITISHANGXIADUICHENGCHUDEGUANZIZHONGDEGANYINGDIANDONGSHIDAXIAOXIANGTONG、FANGXIANGXIANGFAN，TONGGUOLIEKOUCHUXINGCHENGBIHEHUILU（RUTU 8 SUOSHI）。YOUYULIEKOUBIAOMIANBOCENGDEDIANZUJIAODA，CITIEYUGUANZIDEXIANGDUISUDUJIAOXIAOSHI，GANYINGDIANLIUJIAORUO，SUOYIWOLIUFANZUOYONGYUCIJIDEDIANCILIJIAORUO。YAOSHIWOLIUFANZUOYONGYUCIJIDEDIANCILIDENGYUCITIEDEZHONGLI，CITIBIXUYIJIAOKUAIDESUDUXIALUO。JIANDANDESHUO，JIUSHIHUILUDEDIANZUBIANDA，YAODADAOHEWULIEKOUDEGUANZIXIANGTONGDEWOLIU，BIXUYAOZENGDADIANDONGSHI，JIZENGDAGUANZIYUCITIDEXIANGDUIYUNDONGSUDU。
SI、JIANYI
1、DUIYUBENWENKAITOUDELIANXITIFENLIANGZHONGLEIXINGDEDIANCIZUNIXIANXIANGJICHU。
（1）CIJIZHOUXIANGFENBUDEQIANGCITIXIALUODEXIANXIANG
（2）CIJIZAISHUIPINGFANGXIANGDEQIANGCITIXIALUODEXIANXIANG
2、DUIYUCIJIZHOUXIANGFENBUDEQIANGCITIXIALUODEXIANXIANGJIESHIYONGGUANZIQIEGECIGANXIANWEIYI，YONGYOUSHOUDINGZEPANDINGGANYINGDIANLIUFANGXIANG。JINYIBUJICHUTU 4 DEWOLIUFENBU，XIANXIANGYIMULERAN。
3、DUIYUYOULIEKOUDEGUANZIDEWOLIUFENXI，RUORANGXUESHENGRENSHIDAOYAOXINGCHENGHUILU，BIXUYAOGUANYUCITISHANGXIADUICHENGXUANZEHUILU（ZHEIYANGFENXIBIJIAOJIANDAN）。YOUYUDIANLIUYAOJINGGUOQUEKOUCHU，XIANGDUIYUWULIEKOUDEGUANZIDEDIANZUBIANDA，XIANGTONGDIANDONGSHIDEQINGKUANGXIADIANLIUBIANXIAO。YAODADAOHEWULIEKOUDEGUANZIXIANGTONGDEWOLIU，BIXUYAOZENGDADIANDONGSHI，JIZENGDAGUANZIYUCITIDEXIANGDUIYUNDONGSUDU。ZHEIYANGFENXIBIJIAOZHUNQUE，XUESHENGYERONGYILIJIE。
WU、SHUOMING
ZAITANJIU“QIANGCITIZAILVGUANZHONGXIALUOXIANXIANG”SHI，HAIFAXIANLEYIGEYOUQUDEXIANXIANG。YONGPUTONGTIAOXINGCITIEZAIKONGQIZHONGSHUZHIXIALUO，XIALUOGAODUZAI 2m ZUOYOU，CITISHIZHONGCHUYUSHUZHIZHUANGTAI。DANYONG“ZHIJING 10mm，GAODU 60mm”DECIJIZHOUXIANGFENBUDEYUANZHUXINGNVTIEPENGCITIE，ZAISHUZHIZHUANGTAIWUCHUSUXIALUO，FAXIANXIALUO 30cm ZUOYOUCITIEJIUZHUANLE 90°。RUOGANCISHIYANSHUOMING，MEICIXUANZHUANDOUSHIYANNANBEIFANGXIANGPIANZHUAN。JIANGCITIFANFUDIAOZHENGJIAODU，ZAIJIAODUSHIDANGSHINENGGOUFAXIANCITIZAIXIALUOGUOCHENGZHONG，YIZHICHUYUPINGDONGZHUANGTAI。ZHEISHUOMINGDICICHANGDUIQIANGCITIDECILIZUOYONGSHIBIJIAOMINGXIANDE。ZHEITONGSHIYETIGONGLEYIZHONGCEDINGDICICHANGFANGXIANGDEJIANDANFANGFA。ZHEIZHONGXIANXIANGKEYIZUOWEIXUESHENGDETANJIUSHIYAN，TADEMINGZIKEYIJIAO“YONGLUOTIFACEDINGDICICHANGDEFANGXIANG”。