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Moving Stick Man

Moving Stick Man

 

Equipment

Smooth Plate

Dry wipe/ erase marker pen

 

Method

Draw a stick figure on the plate with the dry wipe marker. Add water to the plate to see what happens.

 

Prediction

Can you predict what will happen when the water goes over the stick figure?

 

Results

What happened when the water went over the stick figure? Was your prediction correct?

 

 

Here is a link to a video to show you what should happen -

https://www.youtube.com/watch?v=Dm0IcLGQ2HA

 

 

The Science Bit...

Permanent indelible markers, like the kind that Sharpie makes, rely on inks with a strong adhesive to stick to almost any surface you write on. But dry wipe/erase markers use inks with a minimal adhesive, making notes and drawings that can be easily wiped away afterwards.

 

The ink in dry erase markers is also insoluble. That means it can’t be dissolved in a liquid, and more importantly, it means it’s less dense than water. When you pour water onto a dry erase stick figure doodled on a smooth surface, a strong buoyancy force overcomes the stickiness of the ink, pulling the doodle off the surface and causing it to magically float on the water.

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