1N10.20-Egg in Sheet

1n1020_egg_in_sheet_21n1020_egg_in_sheet

Video: Watch this demo

Instructor’s video 1

Instructor’s video 2

Description: This demonstration shows the importance of impulse.

Equipment:

  • Large white sheet with hooks
  • 2-3 Eggs
  • (Optional) 2-3 blown eggs
  • Orange egg holder
  • Step ladder
  • Sponge
  • Lots of paper towels

Setup Procedure:

  1. Get 4-6 eggs. Place them in the orange egg holder and store in the frig until the class starts.
  2. Hang the white sheet to the top of the classroom using the step ladder (see picture). Spread the sheet out as much as possible.
  3. Throw the bottom of the sheet over the top so it does not take up as much room initially.
  4. Set the eggs, sponge, and paper towels to the side.

Demonstration Procedure:

  1. (Optional) Before class, blow the inside of 2-3 eggs out.
  2. Open the sheet up fully.
  3. Have two people hold each side of the sheet on the bottom. This is so the the eggs does not hit the floor.
  4. Pick a strong student, preferably who plays baseball.
  5. Have them throw the egg against the sheet as hard as they can. Give them a few trys.
  6. You must stress that they do not sqeeze the egg, and that they aim directly at the sheet (not to the side, above, or below).
  7. Note that it will not break. This is because the impulse is small, as the egg came to rest in a relatively long time.
  8. Thorw the same egg the student used at the blackboard.
  9. Note the egg breaks on contact. This is because the impulse is high, as the time for the egg to come to rest is very short.
  10. Clean up the egg from the blackboard as soon as it breaks using a wet sponge and lots of paper towels.
  11. Compare the two different situations and why the egg breaks on the board and not in the sheet. Explain that this is esentailly how a car air bag works.
  12. (Optional) For fun, throw the 2-3 blown eggs (all at once) into the class to give the students a little scare.

22-C2