资源简介 (共23张PPT)3.3我们的水钟聚焦水流的速度水流的速度有什么特点?保持水位高度不变,同一个装置,流出相同水量所需的时间一致。水流速度的等时性。探索一、明确任务让我们制作一个能计时5分钟的水钟。探索二、设计方案制作水钟,我们需要考虑哪些问题呢?我们要做的是什么类型的水钟?要用到哪些材料?怎样控制水流速度?怎样标出刻度?……探索二、设计方案:水钟的类型泄水型水钟受水型水钟探索二、设计方案:水钟的类型探索二、设计方案:图文结合1.剪开塑料瓶2.用工字钉给瓶盖打孔3.重复1、2两步4.三个瓶子重叠组装5.倒水计时,在最下面的容器上标上刻度探索三、制作水钟09000018765432159004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900098765432158004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900088765432157004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900078765432156004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900068765432155004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900058765432154004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900048765432153004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900038765432152004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900028765432151004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900018765432150004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here探索四、测试怎样知道我们的水钟是否准确?0900028765432151004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here0900018765432150004987654321039876543210987654321021987654321098765432100HoursMinutesSecondsInsert Text Here探索五、评估与改进根据测试结果,你的水钟计时准确吗?如果不够准确,我们可以怎样改进?哪些因素可能影响水钟的准确度?容器底部的形状出水孔太小,积水太少,水位变化不明显标记线太粗……拓展除了水,我们还可以用哪些流动的物体来制作计时工具? 展开更多...... 收起↑ 资源预览