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Hold a piece of paper in front of your mouth. Blow across the top surface. What happens to the paper?
This is a situation that can easily explain Bernoulli's Principle. When you blow on top of the paper, the speed of the fluid (air) increases. This means the air pressure decreases. Beneath the paper, there is greater air pressure, thus, slower fluid.
QUESTION NO. 1 State Bernoulli's Principle.
YOU vs THE UMBRELLA vs THE WIND
You must probably experienced this scenario. It was raining so hard. The wind was so strong. You were soaking wet. And you umbrella suddenly created a scene in the middle of the road (in front of your crush!) - THE INSIDE OUT UMBRELLA!
You most likely wished this moment never happened but Daniel Bernoulli had a ready explanation for this.
On top of the umbrella, the fluid (air) is moving fast (Evidence: Strong Wind). Therefore, the air pressure is less here. Inside the umbrella, there is very little space or area, making the pressure great. (Remember, smaller area means greater pressure). The pressure inside the umbrella forces the umbrella to turn inside out.
QUESTION NO. 2
Explain (in terms of Bernoulli's Principle)
a. Why it is not a good idea to close all the windows and doors of your house when there is a typhoon. b. How an airplane flies
PASCAL AND THE AUTOMOBILE LIFT
For sure, you have seen an automobile lift in a gasoline station. On one end is the vehicle being lifted. Let us say that a 1500 kg (14700 N) BMW 5 needs to be raised. Does this mean that the car mechanic need to exert a force of 14700 N? Well, Blaise Pascal will give you a resounding "NO!" as his reply.
Here is how an automobile lift works. There is an underground reservoir of oil in this system. Compressed air will then be released to the reservoir which will exert pressure. The pressure will then be transmitted by the oil to a cylinder. This cylinder lifts the automobile.
QUESTION NO. 3
State Pascal's Principle.
THE DENTIST'S CHAIR
Well, I am not going to ask you if you ever feared the dentist when you were still a kid. But you have to understand that the dentist's chair is an application of Pascal's Principle.
No matter how heavy a person is, he can still be lifted on the dentist's chair. The dentist need not to exert huge effort in doing so. He just has to step on a pedal-like part at the bottom of the chair and the chair will be raised.
PASCAL'S PRINCIPLE WHILE BRUSHING YOUR TEETH?!
Finding it hard to recall Pascal's Principle? Before you brush your teeth, examine your toothpaste. You only squeeze one end of the tube but the force will be transmitted all throughout the tube, resulting to the toothpaste coming out of the tube.
QUESTION NO. 4
List down 2 more machines that apply the Pascal's Principle. Discuss each. (3 sentences will do!)
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