Marvin and Milo

Explore physics the exciting way, by trying out a simple and fun experiment. This month, Growler Don't forget to check back next month for the next edition...

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What you need


Cardboard box



Wet cloth



Make a hole in a cardboard box.

Tie some string round a pencil, and feed the string through the hole so the pencil is inside the box.

Use a wet cloth to pull on the string.

Results & explanation


The box amplifies the vibrations from the string as the cloth is pulled along it, making a sound that our ears can hear. 

Read more about vibrations on


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