Marvin and Milo

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

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What you need




Two cups




Place the middle of a ruler over a pencil.

Put two cups with the same amount of water on either end of the ruler.

Put your finger in the cup that is lifted.

Results & explanation


As you put your finger in the water, the water tries to push up and float your finger. Because of this the finger pushes down on the water at the same time, causing the cup to tip.  

Read more about buoyancy on


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