Everyday Science

Science in Playground

Here we address to reasoning questions arising in the minds of children on the basis of their day to day observations by giving their scientific answers. Some questions which children asked over the years regarding science in the playground are given below :

Mountaineers usually carry an oxygen cylinder with them, why?

For keeping our body systems in order, our body needs to maintain a certain level of oxygen in our blood which we get from air through respiration.

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When a ball is thrown on the ground from a height why does it rebound on striking the ground?

When the ball is thrown on ground, it has certain velocity and therefore it strikes the ground with a certain momentum. Harder the ground and the ball, greater is the amount of the momentum returned by the ground to the ball.

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Why does the depth of a swimming pool appear less than what it actually is?

You may be knowing that in different media light travels with different velocities. Due to difference in velocities of light in different media, when light passes from one medium to another medium,

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A long jumper, when in air-after taking the jump at the starting point and before landing on ground makes some moves as if he/she is running in air, why?

If you think that he may do so to increase his/her speed then your reasoning is not on right track. Without an external force, change in the speed of a body is not possible.

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Why does a long jumper comes running from a distance before taking the jump?

A long jumper has to provide as much force to his/her body as is possible with in his/her strength, so that he/she may land at the farthest distance from the jumping point.

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Do You Know
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Thought
of
the Day
 
Ideas have become far more important to us than action - ideas so cleverly expressed in books by the intellectuals in every field. The more cunning, the more subtle, those ideas are the more we worship them and the books that contain them. We are those books, we are those ideas, so heavily conditioned are we by them. We are forever discussing ideas and ideals and dialectically offering opinions. Every religion has its dogma, its formula, its own scaffold to reach the gods, and when inquiring into the beginning of thought we are questioning the importance of this whole edifice of ideas. We have separated ideas from action because ideas are always of the past and action is always the present - that is, living is always the present. We are afraid of living and therefore the past, as ideas, has become so important to us.
J. Krishnamurti
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