Moving Air and Lift
Moving Air and Lift
Moving Air and Lift:
Moving air can provide a lift. This can be seen in cases like roof blown off during high speed wind. The phenomenon behind the moving air and lift can be understood with the help of following example.
Activity: When we blow on top of a strip of paper
Observation: The paper is pushed up.
Explanation: To understand this, let us look at the forces acting on the strip of paper.
Firstly, there is gravity which tends to pull it down. So, when you hold the paper near your mouth without blowing air, the paper will hang down due to gravity.
However, when you blow the air above the paper, the pressure on top of a strip of paper is reduced.
When we blow on top of a strip of paper the paper is _____________________ . | |||
| Right Option : B | |||
| View Explanation | |||
Which of the following are correct ? (a) There is gravity which tends to pull the paper down. So, when you hold the paper near your mouth without blowing air, the paper will hang down due to gravity. (b) The example of that moving air causes lift is when we blow on top of a strip of paper the paper is pushed up. (c) The moving air causes a drop in pressure explains why roofs, which are not very firmly fixed, are blown off when there is a very strong wind . | |||
| Right Option : D | |||
| View Explanation | |||
Increased wind speed is accompanied by reduced _______________________. | |||
| Right Option : A | |||
| View Explanation | |||
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