Circular Motion
Forces and Motion

Antigravity Maltesers

Enrichment Activity for 5-11 11-14


What you need

  • A wine glass (narrower towards the top)
  • A Malteser

Instructions

  1. Put the Malteser on the table and place the glass over it
  2. Wiggle the glass quickly with a circular motion and the Malteser will start to climb the sides of the glass
  3. Keeping wiggling, lift the glass off the table and the Malteser will stay inside!

Results and Explanation

The glass pushes inwards on the Malteser, forcing it to move in a circle rather than a straight line. But the angle of the glass means that it also pushes upwards on the Malteser, supporting its weight.

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Circular Motion
can be analysed using the quantity Centripetal Acceleration
can be described by the relation F=m(v^2)/R
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