Strong Straws and a Potato

Published: Aug 16, 2023 by Emma Vanstone · This post may contain affiliate links · Leave a Comment

This super simple STEM challenge requires only a straw, a potato and a willing volunteer.

You’ll need

Two paper straws

A large potato ( raw )

Instructions

Pick up one of the straws and try to push it into the potato hard. The straw will most likely bend.

a bent paper straw resting on top of a potato

Take the second straw, and this time cover one end with your thumb. Try and stab the potato again. You should find the straw makes a hole in the potato!

A paper straw which has been pushing into a potato as part of a science challenge

Why does it work?

Paper straws are not particularly strong. If you bang them on a table, they will usually bend, which is what happens if one is used to pierce a potato.

However, when the end is covered, air is trapped inside the straw. When the straw is pushed into the potato, the air is compressed, which increases the rigidity of the straw, making it strong enough to pierce the potato!

If you enjoyed this post, you might like my easy STEM challenges using newspaper too!

Last Updated on August 17, 2023 by Emma Vanstone

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Science Sparks ( Wild Sparks Enterprises Ltd ) are not liable for the actions of activity of any person who uses the information in this resource or in any of the suggested further resources. Science Sparks assume no liability with regard to injuries or damage to property that may occur as a result of using the information and carrying out the practical activities contained in this resource or in any of the suggested further resources.

These activities are designed to be carried out by children working with a parent, guardian or other appropriate adult. The adult involved is fully responsible for ensuring that the activities are carried out safely.

You’ll need

Instructions

Why does it work?

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