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Home > 8th Grade Science > Forces in Fluids > Fluids in Motion

Fluids in Motion

File Attachments:
  1. Directed Reading A M 3_3 Fluids in Motion Directed Reading A M 3_3 Fluids in Motion
  2. Fluids in Motion Text Fluids in Motion Text
Web Links:
  1. Bernoulli's principle Bernoulli's principle
  2. Bernoulli's principle - physics experiment 2 1/2 Bernoulli's principle - physics experiment 2 1/2
  3. Pascal's Law and Hydraulic Brakes Pascal's Law and Hydraulic Brakes
  4. Pascal's Principle - by Sim Mong Chea 3 m Pascal's Principle - by Sim Mong Chea 3 m
  5. Ping Pong Ball in Stream of Water Ping Pong Ball in Stream of Water
  6. The Aerodynamics of Flight The Aerodynamics of Flight
  7. The Bernoulli Effect 5 min The Bernoulli Effect 5 min

Section 3:   Fluids and Motion

What You Will Learn:
 


•

Describe the relationship between pressure and fluid speed.

•

Analyze the roles of lift, thrust, and wing size in flight.

•

Describe drag, and explain how it affects lift.

•

Explain Pascal’s principle.

Bernoulli's Principle:

 
In 1738, Swiss physicist Daniel Bernoulli discovered that as the speed of a fluid increases its pressure decreases. What does that mean? When air is still it pushes equally in all directions. For example, air pressure pushes down on a table, but also up on the underside. But when air moves along the surface of an object the pressure is reduced. A fan blowing across the
surface of the table reduces the downward pressure of air. A light wind has little effect on a heavy object like a table, but a slip of paper illustrates the principle well. Hold a strip of paper under your bottom lip and blow over it with fast stream of air. Your breath creates a low pressure pocket of air above the paper. Below the paper the air pressure is higher and it pushes the paper up.

(The above was taken from http://www.wowmuseum.com/documents/BITWTeachersGuide.pdf)



 

Author: Marilyn Knapp
Last modified: 6/27/2015 5:55 AM (EST)