Forces and Motion


Enrichment Activity for 5-11 11-14

What you need

  • An old CD
  • A sports cap from a drinks bottle
  • Blu Tack
  • A balloon


  1. Place the sports cap in the centre of the cd and fix it in place with the Blu Tack
  2. Blow up the balloon and, making sure the sports cap is closed, pull the open end of the balloon over the cap
  3. Place your hovercraft on a flat surface and open the sports cap. Give it a quick tap and watch your hovercraft go!

Results and Explanation

The air rushes out of the balloon and through the cap, lifting the CD up on a cushion of air. The air reduces the friction between the CD and surface it’s on so the hovercraft can travel a surprising distance before stopping.

is a special case of Force
IOP DOMAINS Physics CPD programme

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This is the first of a collection of videos for you to view ahead of our live support sessions for teachers and coaches of physics.

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