Before the day of my daughter's physical exam, she asked me the question about both uniform motion and uniform accelerated motion.

"O.K. It is not difficult about the study. You can understand it easily using the concept of "death-leap""

I answered.

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Ebata:"When a fall accident happens at a building, there is an easy tip to judge whether it is just an accident or a suicide. The tips are a distance between building and point of fall, and scratches of body."

Daughter:"I am sorry but I cannot understand...."

Ebata:"Could you know that both the speed and the distance is going to be zero at the case of a free fall?"

Daughter:"Yes."

Ebata:"Even if we find some distance, the body might collide with window frames or others of the building. So the body should remain some scratches.

Daughter:"I see."

Ebata:"However, in case of suicide, the person tries to jump in air. So the body keeps the uniform motion until reaching the ground.

Daughter:"O.K."

Ebata:"In this case, the distance is far from the building and, of course, no scratches of body happen.

Daughter:"....."

Ebata:「In the nutshell, in order to understand uniform motion and uniform accelerated motion, it is relatively easy to look on the object as a person.

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After that, I heard that she got full score of the exam, (maybe for the first time in her life).