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Pop cans, tents and bridges!

Pop cans, tents and bridges!. Miss Laverty 2012 ***worksheets, experiments and lesson adapted from the Edmonton Public curriculum book***. Happy Monday!. Hand out the workbooks Grab a copy of today's worksheet Sit down and show me that you are ready to “move some pop cans”.

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Pop cans, tents and bridges!

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  1. Pop cans, tents and bridges! Miss Laverty 2012 ***worksheets, experiments and lesson adapted from the Edmonton Public curriculum book***

  2. Happy Monday! • Hand out the workbooks • Grab a copy of today's worksheet • Sit down and show me that you are ready to “move some pop cans”

  3. Magic Moving Pop Cans • Challenge: use only a straw and your breath to make the two pop cans move towards each other • Materials: two pop cans and one straw • Work with a partner to try different ways to get the cans to move towards each other. Describe your strategies

  4. Magic Moving Pop Cans • What were your strategies? • What worked best? • Diagram

  5. Magic Moving Pop Cans • Results: • The easiest way to get the cans to move towards each other was to blow through the center of the cans with the drinking straw

  6. Magic Moving Pop Cans • Inferences: • When we blow through the center of the two cans, the air is moving quickly • Bernoulli’s principle states that the faster air moves, the less pressure it exerts on surfaces over which it is passing • By reducing the air pressure between the cans, the air pressure on the other side of the cans is now greater than the air in between them • This causes the cans to be pushed together by the regular air pressure of the room

  7. Magic Moving Pop Cans • Real life examples: • Wind chimes

  8. London Bridge is falling down • Question: how does the speed of air affect the pressure it exerts? • Materials: paper • Procedure • Fold a sheet of paper in half to create a tent shape • Predict what will happen when you blow through the tent. • Stand the tent up on the table and hold the corners between your thumbs and forefingers • Blow through the tent • Record observations

  9. Paper Tents and Tunnels • Record a before diagram and a during diagram • Try the tent shape and the tunnel shape

  10. Paper Tents and Tunnels • Inferences • Blowing through the tent produces faster moving air • Faster moving air creates a low pressure area inside the tent • The higher pressure of the air on the outside of the tent causes the sides to bend in

  11. Paper Tents and Tunnels Real life example: • “Galloping Gertie”: a suspension bridge from the 1940s couldn’t handle air blowing under and over the bridge • http://www.youtube.com/watch?v=j-zczJXSxnw

  12. Group Work • Stay on task • Respect the learning of everyone • Follow instructions

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