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一角的大小的比较1.钟面上的秘密。教师出示两个大小相差很大的钟面,钟面的时间都是下午2时整。教师用动画演示大、小两个钟面上的分针从“12”走到“2”。然后问:同学们发现了什么?(让学生充分发言,直到说出:两个钟面上的分针从“12”走到“2”用了相同的时间)教师用课件显示两个钟面上分针针尖转过的弧,然后请大家思考和讨论以下问题:(1)两根分针的针尖运动的路线长短相差很大,为什么用的时间却相同呢?
A comparison of the size of the corner 1. The secret of the clock face. The teacher showed two clock faces of widely varying sizes, clock face time is 2 pm. Teachers use animations to show that the minute hands on the small two clock face go from “12 ” to “2 ”. Then ask: What did the students find out? (Have the students fully speak until they say: The minutes on both clocks go from “12 ” to “2 ” at the same time) Teachers use courseware to display two A minute face on the minute hand tip turned arc, and then please think and discuss the following questions: (1) the two points of the needle tip movement route length varies greatly, why use the same time?