Bernoulli's Principle (Grade 9)
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The faster a fluid flows, the greater the pressure it exerts.
Ship captains must account for Bernoulli's principle when passing nearby in order to avoid collisions.
During a tornado, the roof of a house may blow off because the strong winds create an area of higher pressure outside the house then the pressure inside the house.
Holding a piece of paper to your mouth and blowing a steady stream of air over its top will cause the paper to lift upward.
Bernoulli's principle states that:
- Pressure is transmitted equally through a fluid
- Pressure increases as temperature decreases
- Buoyant force equals weight of fluid displaced
- Pressure in a fluid decreases as speed of the fluid increases
Bernoulli's principle applies to .
- gases only
- liquids only
- both gases and liquids
- neither gases or liquids
Which of the following does Bernoulli's principle help to explain?
- why water expands when it freezes
- why umbrellas turn inside out on windy days
- why condensation occurs on a cold glass of lemonade
- why moving cars take longer to stop on ice than on dry pavement
As part of a physics demonstration, Mr. Taylor suspends two ping pong balls next to each other so that they have a small space between them. He then turns on a hairdryer and has it blow air in the space between the two ping pong balls. Which of the following should happen?
- the two balls do not move
- the two balls move upward
- the two balls move further apart
- the two balls move closer together
A large truck passes a car on the highway. According to Bernoulli's principle, which of the following should occur?
- pressure decreases between the vehicles so the car and truck move slightly apart
- pressure decreases between the vehicles so the car and truck move slightly together
- pressure increases between the vehicles so the car and truck move slightly apart
- pressure increases between the vehicles so the car and truck move slightly together
Two tall buildings are separated by a narrow alleyway. On a windy day, wind gusts move very quickly through the alley. If the buildings are not constructed properly, which of the following could be a concern when this occurs?
- the buildings' windows could be blown outward into the alley because of air pressure differences
- the buildings' windows could be blown inward into the building because of air pressure differences
- the buildings' windows could be blown outward into the alley because of temperature differences
- the buildings' windows could be blown inward into the building because of temperature differences