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Science Snacks
Science activity that demonstrates static electricity

Holding Charge

Make it stick with static.

Use static electricity to stick a straw to the palm of your hand, a window, a door, a wall—or just about anywhere.


Grade Bands: 
3-5
6-8
9-12
Subject: 
Chemistry
Materials & Matter
Physics
Electricity & Magnetism
Keywords: 
electrostatics
charge
straw
electron
NGSS and EP&Cs: 
ESS
ESS2
PS
PS1
CCCs
Cause and Effect
Energy And Matter
Structure and Function

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Tools and Materials

  • Plastic straw in paper wrapper (if no wrapper is available, use a paper napkin)
  • Clean, dry vertical surface: a hand, window, wall, or door

Assembly

None needed.


To Do and Notice

Note: This Snack works best when done on a dry, low-humidity day.

Tear off one end of the wrapper on a new straw. 

With one hand, tightly hold the newly exposed plastic straw. With the other hand, gently yet firmly grasp the remaining paper wrapper.

Quickly slide the wrapper back and forth over the straw. Keep sliding it until the straw and wrapper feels warm (10 strokes should do the trick).

Remove the wrapper and immediately place the straw on a smooth, clean vertical surface where it will stick.

Try doing this experiment again. See what else you can stick your straw to.


What’s Going On?

Did you get a charge out of this? You sure did. You electrically charged the straw by causing negatively and positively charged particles to move around.

After rubbing it with its paper wrapper, the straw has more negatively charged particles left on it. This makes the straw negatively charged. When you bring your negatively charged straw near a neutral object, like your palm, it pushes away electrons in your palm and induces a local positive charge. Since opposites attract, the straw sticks to your hand.


Going Further

Here are some other things to try:

  • Hold two charged straws vertically next to each other. What do you feel?
  • Lift small objects with your charged straw: salt, pepper, and confetti, for example.
  • Use your straw to roll an empty soda can.
  • Rub other materials on your straw to see what happens.

Teaching Tips

Rubbing two dissimilar materials together can generate static electricity. Use this activity as an introduction to the phenomenon known as the triboelectric effect. This can lead to investigating other materials that will create static electricity.



Related Snacks

Science activity that demonstrates electrostatics
Remote-Control Roller

Wield electrons and protons to roll cans.

Science activity that demonstrates levitation with electrostatics
Flying Tinsel

Use electrostatic repulsion to suspend tinsel in the air.

Science activity detecting electric charge
Electroscope

Build an electroscope to detect electrical charge using straws.



Creative Commons License



This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Attribution: Exploratorium Teacher Institute

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