Friction
Forces and Motion

Take the Money

Enrichment Activity for 5-11 11-14


What you need

  • A narrow-necked glass bottle
  • An old bank note
  • A table

Instructions

  1. Balance the bottle upside down on the bank note.
  2. Try whisking the note away without tipping the bottle over. What happens?
  3. Gradually roll the note very tightly towards the bottle. Start gently nudging the bottle with the note as you reach it. Keep rolling the note.

Results and Explanation

You can remove the note safely. Friction between the bottle and note makes the note pull the bottle with it, but you counteract this by supplying a small force in the opposite direction through nudging it a little as you roll.

Friction
is a special case of Force
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