6 The secret of the pendulum摆的秘密 What are the factors related to the speed of pendulum movement?摆摆动的快慢与什么因素有关? How does the pendulum transform energy in the process of swinging?摆在摆动的过程中能量是怎样转化的? We prepare screw cap, small iron lock, play-doh, thin wire, stopwatch, etc. to study the secrets of the pendulum.我们准备螺丝帽、小铁锁、橡皮泥、细线、秒表等来研究摆的秘密。 Find a pendulum-like phenomenon in life找一找生活中类似摆的现象 Make a pendulum and study its secrets.做一个摆,研究它的秘密。 When a pendulum swings out and back, it swings once.摆在摆动时,摆出去,再回来,叫摆动一次 Let's design an experiment。我们设计一个实验方案 How can we make the pendulum swing faster?怎样能让摆摆得快一些? Design a table to record the experimental data设计一个表格记录实验数据 My notes and findings我的记录与发现 Why can a pendulum keep swinging for a long time?摆为什么能长时间不停地摆动? Why does the pendulum stop slowly after a while?过一段时间,摆为什么会慢慢地停下来? What we know我们的认识 Make an obedient pendulum.做一个听话的摆。 How to do it?怎么做呢? Make a pendulum that swings 50 times a minute做一个一分钟摆动50次的摆 Make a pendulum that swings 80 times a minute.做一个一分钟摆动80次的摆 Small experiment: Suspend an hourglass by a thin rope of about one meter, with the upper end fixed on a grapevine (or on the ceiling, on a tree, etc.).小实验:用一条一米左右的细绳悬吊一个沙漏,上端固定在葡萄架上(或天花板上、树上等)。 Pull the hourglass and let go of it at a point slightly below the upper suspension point and observe the sand traces.拉动沙漏,在略低于上端悬吊点的位置放手,观察沙迹。 What do you find?你有什么发现? |
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