Summer is the time for super fun, outdoor science experiments. We always seem to tackle harder science topics in the summer because the days are longer and the minds are sharper from all that extra time spend outside. Today we are going to share with you Twisting Soda Can experiment. In this fun activity we use the force of gravity to twist an empty soda can. In my mind I file this activity under Introduction to Physics for Little Kids. If you would like to know more about The Physics of Twisting you can read an earlier post here.
Twisting is one of the most common actions we perform on a daily basis. According to Oxford dictionary twisting means bending into a specified position, moving in such a way that two parts of a body are facing in opposite directions or causing to rotate. The subject of this post is the latter part of the definition “causing things to twist.” To make it a terrific learning experience start by asking some questions about twisting. What can you do to twist an empty can of soda without using your hands directly? Is it possible to twist a can of soda by filling it with water? Why not? Would poking holes in a can help it twist? Does it matter where the holes are? Their shape? And direction?
My family doesn’t buy anything that comes in cans, so we had quite an adventure looking for cans in back alley recycling bins. What we wouldn’t do for science! We found that longer cans twist much faster than standard cans.
Twisting Soda Can Experiment for Kids
What you need
Empty soda cans (3-4)
1.Poke three holes along the bottom of a soda can. We used a nail and angled it to give water a direction.
2. Tie a string or shoe lace to the top of the can and fill it with water by submerging it in a pot of water (or use a garden hose).
3. Lift the can in the air by the string and watch it spin.
If you have observed my kids’ excitement in person, you would have thought they have never seen water before.
They wanted to do it again and again and again.
Now vary the position of holes.
We did three holes along the top of the soda can.
Three holes horizontally, one on top of another, on one side of the soda can.
And random collection of holes all over.
None of the new varieties produced a spinning motion, but we had fun trying.
The position of holes and their direction are of the utmost importance. When we poke holes around the bottom edge of the can, we harness the power of the gravitational pull. The pressure of the water as it pours out, plus the angle of the holes makes the can spin. When the holes are positioned along the top edge of the can, the water is not coming out with the force and nothing exciting happens.
- If your can is not twisting, you might want to change a string. We had to try maybe five different models before we found the best fit.
- Keeping a can straight helps the rotation, so if your can is leaning glue the top flap to the can. This way when you hold it by the string, the can will be parallel to the ground.
- We found that larger and longer beer cans rotate much faster and in more impressive fashion than regular 11 oz soda cans.
To better understand the basics of twisting, please, read this post The Physics of Twisting for Kids.