Marvin and Milo
Explore physics the exciting way, by trying out a simple and fun experiment. This month, Static spinning straw Don't forget to check back next month for the next edition...
Static spinning straw
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What you need
A drinking straw
Plastic bottle cap
A jumper
Your hands
Instructions
- Place the plastic bottle cap on a table. Rub the straw with a jumper several times in the same direction and then carefully balance the straw on the cap.
- Bring one hand close to the straw, but don’t touch it. The straw will start to spin!
- Experiment with where to put your hand to get the best response. Does one end of the straw respond better than the other? Does using two hands rather than one make a difference?
Results & explanation
Rubbing the straw makes it negatively charged and this induces a positive charge in your hand. The attraction between the straw and your hand makes the straw follow your hand as you move it.
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