高考物理复习第六章静电场第2节电场能的性质市赛课公开课一等奖省名师优质课获奖课件.pptx

返回,第,2,节,1/54,课前回顾,基础速串,课堂提能,考点全通,课后演练,逐点过关,2,3,1,2/54,宏观整合，微观提醒，回顾旧知短平快,课,前,回,顾,基,础,速,串,3/54,4/54,5/54,易点速过，难点精研，时间用到增分点上,课,堂,提,能,考,点,全,通,6/54,7/54,判断方法,方法解读,公式法,将电荷量、电势连同正负号一起代入公式Epq，正Ep绝对值越大，电势能越大；负Ep绝对值越大，电势能越小,电势法,正电荷在电势高地方电势能大,负电荷在电势低地方电势能大,做功法,电场力做正功，电势能减小,电场力做负功，电势能增加,能量守恒法,在电场中，若只有电场力做功时，电荷动能和电势能相互转化，动能增加，电势能减小，反之，动能减小，电势能增加,8/54,9/54,10/54,11/54,12/54,13/54,14/54,15/54,16/54,17/54,18/54,19/54,20/54,21/54,22/54,23/54,24/54,25/54,26/54,27/54,28/54,29/54,30/54,31/54,32/54,33/54,34/54,35/54,36/54,37/54,38/54,39/54,40/54,41/54,42/54,43/54,电场力做功计算方法,电场中功效关系,(1)电场力做正功，电势能降低，电场力做负功，电势能增加，即：WEp。,(2)假如只有电场力做功，则动能和电势能之间相互转化，动能(Ek)和电势能(Ep)总和不变，即：EkEp。,44/54,45/54,关键点,获取信息,在匀强电场中,电场力为恒力,0.20,受滑动摩擦力作用,46/54,47/54,48/54,49/54,50/54,51/54,52/54,53/54,谢,谢,观,赏,54/54,