Download - Bernoulli’s Principle Natalie O’Neal Vickie Rincones Emily Perkins Brittany Schultz Tenneille Duke
Bernoulli’s Principle
Natalie O’NealVickie RinconesEmily Perkins
Brittany SchultzTenneille 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 experimentsAuditory learning by listening to lectureVisual 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 hands-
on 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.