Other uses of rulers

Generally speaking, students use rulers to measure length. Is there any other use of rulers besides these? Let’s take a look at it.
It is believed that many students have done experiments on measuring “reaction time”. Take a 20 cm long ruler and hold it by one of the students in a vertical state. Another student’s hand is placed on the zero scale line of the ruler. At some point, the student releases the ruler. From the students below, he sees that the students above release the ruler. The time it takes for him to grasp the ruler is called “reaction time”. And according to the gravity acceleration and the scale of the ruler being caught, we can also judge the speed of the ruler falling, which is an experiment of coexistence of learning and entertainment.
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Post time: May-16-2019
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