Question

Q.1 when we blow over a paper strip it goes upward why?

Answer 1

Answer:

When we blow air above the paper strip, low pressure is created above the strip, because high speed winds are always accompanied by reduced air pressure. Therefore, because of the higher pressure below the strip it is pushed upwards.

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Answer 2

When we blow over a paper strip it goes upward due to the Coanda effect.

Explanation:

• When you blow air over the piece of paper then the air pressure below the paper becomes more than above.
• As air particles move from higher to lower pressure, they lift the paper upward.
• The usual explanation is that Bernoulli says that when air moves faster, the pressure is lower. That is true. But lower than what? It is lower than the pressure inside your lungs.