Inertia
Forces and Motion

Skewered

Enrichment Activity for 5-11 11-14


What you need

  • A metal skewer (or knitting needle)
  • An apple
  • A hammer
  • An adult*

Instructions

  1. Push the skewer through the centre of the apple until it is sticking out by about 5cm
  2. *Ask an adult to help with the skewering
  3. Holding the skewer horizontal, hit the blunt end with the hammer. What happens?
  4. Holding the skewer vertically, what happens this time when you hit the skewer?

Results and Explanation

In both cases, the skewer moves further through the apple each time you hit it because of the apple’s inertia.

Inertia
is formalised by Newton's First Law
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