Devers K – 8
Students experiment with gravity, cohesion and surface tension at Devers
Well, 3rd and 4th grade students in Mr. McIntyre’s and Ms. Petry’s classes at Devers did just that.
Students really fought through the frustrations and struggles that come along with being a scientist during this experiment. They balanced the craft stick on the chopstick by changing the craft stick’s center of gravity.
After this experiment, they were balancing professionals. They went on to balance anything they could find, ranging from straws, pencils, and even toilet paper tubes.
Students were literally jumping with joy when they finally figured out the solution to this balancing act!
— Kelly Petry, Devers teacher
Students measured drops of water on a coin, carefully adding as many drops as possible until the surface tension could no longer hold the volume of water, and the water leaked off of the coin. Then, students applied a mystery solution to their coin and repeated the experiment.
We discovered that our mystery solution reduced the amount of drops we could keep on a coin, and we inferred that the mystery solution must have changed the cohesive properties of the water in some way, making it less cohesive.
Can you guess what our mystery substance was? Hint: you use it every day at your sink…
— Denise Mace, Devers teacher