Transcript Document

Flying toilet paper, funnel ball
and curve balls
Miss Laverty 2012
***experiments, lesson and worksheet
adapted from the Edmonton Public School
Division curriculum book***
Tuesday, March 6th 2012
1) Hand out the work books
2) Grab today’s handout
3) Sit down and show me you are
ready to make some toilet paper
FLY!
Flying Toilet Paper
• Materials: one roll of toilet paper and one
blow dryer
Flying Toilet Paper
• Procedure:
1. Have someone hold the toilet paper horizontally
with their index fingers
2. Blow over the top of the roll with the hair dryer
set on full speed
3. Observe and record results
4. Clean up the mess!
Flying Toilet Paper
• Results:
– the toilet paper unraveled off of the roll and
lifted into the air
Flying Toilet Paper
• Variations: Try this experiment with a strip of
paper. Hold one end of the paper under you
bottom lip and blow over the surface of the
paper to make the paper to lift
Flying Toilet Paper
Diagram
Flying Toilet Paper
• Inferences
– Fast moving air exerts less pressure on the
surfaces that it passes over
– The air moving over the top of the roll has less
pressure than the normal air below it
– The normal air pressure is considered high
compared to the fast moving air above the paper
– This causes the normal air pressure under the
paper to lift or rise the paper
– This demonstration of Bernoulli’s principle
Flying Toilet Paper
• Real life examples
– Streamers on a fan
– Kite flying
Funnel Ball
• Challenge: try to blow the ball out of the
funnel using only your breath
• Materials: funnel and ball (Styrofoam or PingPong)
Funnel Ball
• Procedure:
– Put the ball in the funnel and hold the funnel
upright
– Predict what will happen when you blow into the
funnel
– Blow hard into the funnel
– Observe and record results
Funnel Ball
• Prediction: I predict that when I blow into the
full the ball will _____________________.
– Fly out, stay in, hover…
Funnel Ball
• Results: When I blew into the funnel the ball
____________________________________.
• Variations: Try this experiment upside-down.
Does the ball stay in the funnel when you are
blowing? Explain
Funnel Ball
Diagram
Funnel Ball
• Inferences:
– The air blowing through the funnel is moving
quickly
– Fast moving air exerts less pressure over the
surfaces that it passes
– This fast moving air creates a low pressure area
– The regular air pressure of the room pushes down
on the ball stopping it from leaving the funnel
Funnel Ball
• Would stronger, faster air flow blow out the
ball?
• Let’s try the blow dryer!
Funnel Ball
• Real life examples
– Curve ball in baseball
– http://www.youtube.com/watch?v=WhXZ186FNIk
Title Pages
• Work on title page sections:
– Air takes up space and exerts pressure
– Air is fluid and capable of being compressed
– Air is composed of different gases
– Bernoulli’s principle