Transcript Bernoulli`s Principle

Bernoulli’s Principle
Natalie O’Neal
Vickie Rincones
Emily Perkins
Brittany Schultz
Tenneille Duke
Introduction
• Subject: Science
• Objective: To discover Bernoulli’s Principle
• Materials: Hair dryer, ping pong balls, balloons,
straws, and coke cans
• Methods: Notes and experiments
• Grade: 8th grade
• Age: 13 & 14 year olds
• Languages: 2 - English and Spanish
Strategies
• Sheltered Instruction
• Scaffolding by repetition of vocabulary
• Cooperative learning by working in groups
• Students learn through:
 Kinesthetics by performing experiments
 Auditory learning by listening to lecture
 Visual learning by seeing realia and watching video
Bernoulli’s Principle
• What are we learning today?
– Bernoulli’s Principle
• Why are we learning about it?
– To understand pressure systems and apply
them to real life examples
• How are we going to learn?
– We will learn through note-taking and handson experiments.
• What should we know before we begin?
– Key Terms: Speed, Velocity
Who is Bernoulli?
• 18th century Swiss scientist
• Studied fluid flow in pipes
*Fluid = any liquid
Vocabulary
• Speed = Rapidez - how fast something moves
Formula: Distance / Time
• Velocity = Velocidad – speed of an object and its
direction of motion
• Air Pressure = Presión de Atmosférica – the force
exerted by air on any surface in contact with it
• Lift = Ascender – raise from a lower position to a
higher position
*Exerted = pushed
Bernoulli’s Principle
• Textbook Definition: When the speed of a
fluid increases, internal pressure in the fluid
decreases.
• Our Definition: When speed increases,
pressure decreases.
*Increase = to go higher
*Pressure = a type of force
*Decrease = to go lower
High Pressure/Low Pressure
• High Pressure always travels to Low
Pressure areas.
Experiments
• Video Link:
http://www.youtube.com/watch?v=ctJyu5ete6Y
• Hair dryer demonstration
• Coke can demonstration
Additional Examples
• 1. Umbrella
– The curved part of an umbrella causes air moving across it
to have a higher velocity (similar to an airplane’s wing).
– On a windy day, the higher velocity creates much lower
pressure on the top of the umbrella.
– The high pressure under the umbrella pushes up to the
lower pressure, causing the umbrella to turn inside out.
Additional Examples
• 2. Faucet and ball
– The moving water creates low pressure because of
the increased velocity.
– The high pressure around the stream pushes the
ball towards the low pressure, causing it to touch
the water stream.
Additional Examples
• 3. Perfume Sprayer
– When you squeeze the bulb, air rushes across the
open end of the tube to create low pressure.
– Higher pressure on the liquid pushes it up and it is
carried away by the stream of air.
Additional Examples
• 4. Insects
– Insects increase their lift by flapping their wings
forward and backward, not up and down.
– The tilt of their wings provide an angle to create
low pressure and lift.
Additional Examples
• 5. Shower curtain
– When taking a shower, the moving water creates
low pressure inside the shower.
– High pressure outside the shower moves towards
the low pressure, causing the shower curtain to
swing against your legs.