凤凰彩票

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刹车装置中的科学知识——九年级物理上册《机械能》教学过程记录
发布时间: 2020-08-12 来源:凤凰彩票_首页

教学背景

凤凰彩票《jixieneng》shijiunianjiwulishangcedisanzhangdierjiedeneirong。zheijiekeneirongduo、nanduda,daduoshujiaoshizaishangwanyizhangdexinkeyihou,huianpai《jixieneng》dezhuantifuxi,yiqijiangsuoxuegainianjiegouhua、xitonghua。zhengjiekeweirao“chachezhuangzhi”jinxingyanjiu,bingshejilesangerenwu。congjingdianshiyanzhongde“chachezhuangzhi”daoqichede“chachezhuangzhi”,zaidao “chachezhuangzhi”desheji。tongguo“chachezhuangzhi”deqingjingxian,jinxingdongnengdaxiaodebiaoda、dongnengdezhuanhuadengzhishideshenduxuexi,shixueshengdesiweidadaoguanliantuozhanshuiping。

教学实录

凤凰彩票shi: 10yue1ri,xiaomingquanjiayiqizuochedaowaidiyouwan,zaigaosugonglushangfaxianqichedechacheshiling,yijiarendunshixianrukonghuang。xiamianwomenyiqiguankanyixiadangshideshipin,zaiguankandeguochengzhongsikaozheiyanglianggewenti: shipinzhongshikongdeqichejuyoushenmeneng?wutiyou“neng”keyiduiwaizuogong,womenkeyitongguoshenmelaipanduanshikongqiche“neng”dedaxiao?

sheng: shipinzhongshikongdeqichejuyoudongneng。

凤凰彩票sheng1: fashengchehuoshi,keyitongguoqichesunhuaichengdulaipanduandangshidongnengdedaxiao。

凤凰彩票shi: shipinzhong,qichedeshenmezhuangzhishilingle?

sheng2: chachezhuangzhi。

凤凰彩票shi: chachezhuangzhidezuoyongshishenme?

sheng2: shijiangqichededongnengjianxiao,jiangqichededongnengzhuanhuachengqitaxingshideneng。

shi: hao,jintianwomenjiuyiqilaiyanjiuyixiachachezhuangzhi。

凤凰彩票dianxingrenwuyi: tongguoleibiqiche,ganshoushiyanzhongde“chachezhuangzhi”

shi: qingdajiakanyigejingdianshiyanshipin(jieturuxia),bingsikaoyixiajigewenti。

shi: gaishiyandeyanjiuduixiang、yanjiumudeshishenme?

凤凰彩票sheng1: gaishiyandeyanjiuduixiangshixiaoqiu,yanjiuwutidedongnengyushenmeyinsuyouguan。

shi: xiaoqiudedongnengdaxiaoyushenmeyinsuyouguan?

凤凰彩票sheng2: yuxiaoqiudesuduhezhiliangyouguan。

凤凰彩票shi: zaishiyanguochengzhong,xiaoqiudedongnengshizaibianhuade,womenyanjiuxiaoqiunayidiandedongneng?

凤凰彩票sheng3: zaipengzhuangdianbshidedongnengdaxiao。

凤凰彩票shi: xiaoqiuzaibdiandedongnengconghezhuanhuaerlai?guanchazhuomianyiqi,sikaozhuanhuadongnengdeqitafangfa。

凤凰彩票(xueshengfenxiaozujinxingjiaoliu)

sheng4: yongshoutui,shixiaoqiuzaibdianxingchengdongneng。

sheng5: yongdanhuangtui,shixiaoqiuzaibdianxingchengdongneng。

sheng6: yongdanbaitui,shixiaoqiuzaibdianxingchengdongneng。

shi: xiangfahenyouchuangyi,dajiakeyiyongzhuomiandeyiqichangshiyixia。

凤凰彩票(xueshenggenjuzhuomianyiqikaishishiyan)

shi: butongdefangfadoushixiaoqiuzaibdianchuyoudongneng,nengfoushuoyixiayuxiemianchanshengxiaoqiudongnengdequbie?

sheng7: yongshoutuishixiaoqiuzaibdianxingchengdongneng,bunengzuodaomeicidouyiyang。

sheng8: yongdanhuangtuishixiaoqiuzaibdianxingchengdongneng,bunengzuodaomeicidounengpengzhuangxiaomukuai。

sheng9: yongdanbaituishixiaoqiuzaibdianxingchengdongneng,bunengzuodaomeicidounengpengzhuangxiaomukuai。

shi: zheixiebanfadouyonglenengliangdezhuanyihezhuanhua,danshizhunqueduhechenggonglvburukebenshangdeshiyangao。

shi: xiaoqiucongbdiandaocdian,sudujianxiaodao0,xiaoqiujianxiaodedongnengdaonaliqule?

凤凰彩票sheng10: youyuxiaoqiudetuili,xiaomukuaikefumocalizuogong,xiaoqiudedongnengzuizhongzhuanyiqiezhuanhuaweixiaomukuaideneineng。

shi: ciguochengzhongkeyitongguoshenmefanyingxiaoqiuzaipengzhuangdianbdiandedongnengdaxiao?

凤凰彩票sheng10: xiaomukuaideyidongjuli。

shi: henhao,zheishikexuetanjiuzhongdechangyongfangfa,womenchengweizhuanhuanfa。

凤凰彩票shi: xiaoqiudongnengdedaxiaohainengzhuanhuachengnaxiekeyizhijieceliangdewuliliang?

sheng11: keyirangxiaoqiuquzhuangjimianfentuan、xiangpini,celiangaoxianshendu。

sheng12: keyirangxiaoqiuquzhuangjijimu,jiliangzhuangdaodejimushuliang。

sheng13: keyirangxiaoqiuzaishoujinshanggundong,celianggundongdejuli。

凤凰彩票shi: shiyanzhongdexiaoqiuzaimukuaizuoyongxiatingxia,qichezaichachexitongzuoyongxiatingche,ruguojiangyundongdexiaoqiukanchengbenchideqiche,xiaomukuaixiangdangyuqichedechachezhuangzhi。xiaoqiumeiyoumukuaijiangwufakuaisutingxia,weilejishitingche,qicheyaoyouchachezhuangzhi。

(shejiyitu: tuchuzhuanhuanfa、leibifa、moxingfadeyingyong。leibifadezuoyongshi“youcijibi”,leibisiweideguochengjiushiyigetuiliguocheng。xueshengjianggaosuxingshideqichejiansuguochengzhuanhuaweixiaoqiudeyundongguocheng,liyongwulimoxingjianhuashijifuzaguocheng,tuchuzhuyaoyinsu,tixianlecongshenghuozouxiangwulidezhongyaosixiang)

dianxingrenwuer: tongguoyueducailiao,lejieqichezhongde“chachezhuangzhi”

shi: weilejishitingche,qicheyaoyouchachezhuangzhi,xiamianwomenguankanshipinbingsikaojigewenti。

凤凰彩票(xueshengguankanqichechachezhuangzhidegongzuoyuanliheshipin,yueduyouguanqichechachezhuangzhidejieshao)

凤凰彩票shi: feibendeqichejinjizhidongshi,dongnengzenyangbianhua?

sheng: qichededongnengjianxiao。

凤凰彩票shi: dongnengzhuanhuachenglechachexitongshenmexingshidenengle?

sheng1: neineng。

凤凰彩票shi: yincizaipanshangongluxiaposhi,youyujingchangchache,chachexitongneinengzengjia,chachepanwendushenggao,huiyingxiangchachedexiaoguo,yinfashigu。

shi: luntaiyudimianbudahuashi,qichedechachejuliyunaxiewuliliangyouguan?

凤凰彩票sheng2: zengdachachejulideliang: qichedezongdongneng(m,v);jianxiaochachejulideliang: chachepanyuqiandemocali(f ), chachepandedaxiao。

凤凰彩票shi: dahuoche、xiaoqicheweishenmebunengchaozai、chaosu?

凤凰彩票sheng3: chaozai、chaosushiqichededongnengzengda,nengduiwaizuogengduogong。chacheshichachepankefumocalizuogong,xiangtongmocalixiadongnengdadechechachepanzhuandongdequanshuzengjia,qicheyaojingguogengzhangdejulicainengtingxia。

凤凰彩票shi: weishenmezaitongyangdaolushang,butongdechexingxiansubuyiyang?

sheng4: butongdechexingzaitongyangdaolushangdongnengbutong,chachexitongyebutong。chachehou,qichebixuzaiyidingfanweineitingxia,zheijiuxuyaoyidingdexiansu,butongdechexingbutongdexiansu。

凤凰彩票shi: f1saicheweishenmezuigaosuduzheimegao?

凤凰彩票sheng5: yinweif1saicheyougenghaodechachexitong,shidediaosuxingshidesaicheyekeyizaiguidingjulineitingche。

凤凰彩票(shejiyitu: weishenmebunengchaozai、chaosushiyigexitongwenti,xueshengyinggaizhandegenggaocainenghuidadegengzhunque。xueshengtongguoziliaolejieqichechachezhuangzhidegongzuoyuanli,lejiexiandaiqichegongyedechachexitongsheji,tuozhanzhishimian,jifaxuexixingqu)

凤凰彩票dianxingrenwusan: tongguofenzutaolun,shejiqichezhongde“chachezhuangzhi”

凤凰彩票shi: chachezhuangzhiduiyujiashizheeryanjiushishengmingdebaozhang,qingtongxuemenjieheshiyanheziliaosikaobingtaolunruheshejianquandechachezhuangzhi?

sheng1: jiadachachepanzhijing,keyitigaochachedexiaoguo。

sheng2: jiadapanyuqiandeyalihecucaochengdu,keyitigaochachedexiaoguo。

sheng3: yaoxuanzehaodeluntai,burongyidahua。

sheng4: chachepannaigaowen,zhangshijianxiapoqichedechachexiaoguobuhuishiling。

凤凰彩票sheng5: yaozengjiayoumenhechachedewucaizhuangzhi,zengjiaqichedexiansuzhuangzhi。

shi: youdechezhubachelungaidayihao,kanqilaikeyigengweiwu,shifouheli?

sheng6: buheli,chachezhuangzhiruguobujiaqiang,huiyingxiangchachexiaoguo。

shi: youdechezhubaqichededongligaida,keyikaidegengkuaiyixie,shifouheli?

sheng6: yebuheli,chachezhuangzhiyuqichededonglishiyaopipeide,zhigaidonglihuizengjiachachejuli。

shi: wanyizaigaosugonglushangchacheshilingzenmeban?

sheng7: zaigaosugongludezhangxiapo、jiwan、shigupinfadiduanyouhuanchongdai,kaishangqujiukeyitingche。

shi: henhao,zheileihuanchongdaitongchangyousha、shi、nituyishierjian,zhuanyongyuzhidongshixiaocheliangdejiashiyuanzhudong“zhuang”shangzheixieshashiduiyidadaojiansudemude。

shi: zuoweichuzhongsheng,womenzenyanganquanchuxing?

sheng8: buchuanghongdeng,tixingqinrenbuchaosu、buchaozai,gaosugonglubutingche,chachepanzaifuwuquziranlengque。

凤凰彩票(shejiyitu: xueshengtongguoxiaozutaolun,shejigailiangqichechachezhuangzhi,shendulejieqichegongyeshejidemeili,congwulizouxiangshenghuo。xueshengtaolunanquanchuxingdeyaodian,congyuanlishanglijieshenghuozhongruhebimianjiaotongshigufasheng,rangxueshengxueyizhiyong)

jiaoxuefansi

fuxikeyaoshangchuxinyi,congzhishizouxiangzhishideyingyong;yongzhishilaijiejuewenti、jieshixianxiang;congzhishizouxianghuodezhishi、yanjiuweizhidefangfa。zaifuxikeshangrangxueshengwenguerzhixin,yaozhuzhongwulizhishiyuxiandaikejidejiehe,yongshubenzhishilaijieshigongcheng、sheji、shebeizhongdeyuanli。

shangkekaishi,jiaoshiyi“xiaomingquanjiayiqikaichedaowaidiyouwan,zaigaosugonglushangfaxianqichedechacheshiling”zuoweikaipianyinru,yongxiangguanshipinyinqixueshengzhuyi。xueshengjinruzhuangtaihou,jiaoxuebubushenru,yi“chachezhuangzhi”weixiansuojinxingzhishiyufangfadeshenduxuexi。

凤凰彩票zairenwuyizhong,hexinzhishishi“yanjiudongnengdaxiaoyushenmeyinsuyouguandeshiyan”,baokuoshiyanmude、yuanli、buzhou、jielun;hexinfangfashi: zhuanhuanfa、kongzhibianliangfa;siweishuipingdadaoduodianjiegoushuiping。renwuwanchenghoutichu: shiyanzhongdexiaoqiuzaimukuaizuoyongxiatingxia,qichezaichachexitongzuoyongxiatingche,ruguojiangyundongdexiaoqiukanchengbenchideqiche,xiaomukuaixiangdangyuqichedechachezhuangzhi。xiaoqiumeiyoumukuaijiangwufakuaisutingxia,weilejishitingche,qicheyaoyouchachezhuangzhi,yinchudiergerenwu。

凤凰彩票zairenwuerzhong,xueshengtongguoyuedushixianzhunbeidecailiaolejiechachezhuangzhi,cailiaozhongdehexinzhishishi: chachezhuangzhishiyigejiangdongnengzhuanhuaweineinengdezhuangzhi,bingqieshitongguomocalizuogongdefangfa;hexinfangfashi: leibifa、moxingfa;siweishuipingdadaoguanlianjiegoushuiping。

zairenwusanzhong,tongguofenzutaolun,shejiqichezhongde“chachezhuangzhi”。yongzhishijiejueshijiwenti,xueshengfenzutaolunshejichachezhuangzhi,bingtaolunchacheshilingzenmeban?taolunanquanchuxingdeyaodiandeng。

凤凰彩票benjiekeshejidezhishizhuxianzhonganzangfangfafuxian,qiangdiaolezhuanhuanfa,fuxilekongzhibianliangfa,yinchuleleibifa,yanshilemoxingfa。benjiekedeshejiyebijiaozhongshisiweidetisheng,yisolofenleifenxi,xueshengdesiweijiegoucongdandianjiegoudaoduodianjiegouzaidaoguanlian,zuihoudaochouxiangtuozhanjiegou,shuipingzhujiantigao,fuherenzhiguilv。

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