2B20.65 Bag Blowup

Concepts

Small forces on small areas transfer to large forces on large areas

Overview

When a bag is inflated, it lifts a weight placed on top of it.

Details

Equipment

  • [1] Weight
  • [1] Sealed plastic bag with a tube attached
  • [1] Plank of plywood that is roughly the same size as the bag

Important Notes

  • A textbook works very well as a weight

Script

  1. Place the bag on the table.
  2. Place the piece of plywood on the bag to protect it from the weight.
  3. Place the weight on the plywood.
  4. Blow into the tube to inflate the bag. The weight will be lifted by the inflating bag.

Additional Resources

References

  • PIRA 2B20.65

Disclaimer

  • Don't attempt this at home!

Last revised

  • 2018

Technicals

  • A tube was inserted into one corner of a sturdy square storage bag and the bag was sealed with tape
  • The bag is roughly the size of a first year physics text book

Related AV

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If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.