Friday, March 7th, 2014
Second graders have been investigating the motion of objects that roll. With two cups taped together, the rim of each cup acted like a wheel as students rolled them down a ramp. Rolling is one more motion they can add to their list of experiences.
After they saw how the cups rolled, a penny was taped to the side of the cup. Students observed that the cups no longer rolled smoothly. If the penny started in the down position, it acted like a brake and kept the cup from rolling. If the penny started in the top position, it made the cup roll in a bumpy way.
Have you ever had ice build up in the rim of your car? It makes your ride very bumpy. This is the same phenomenon. Kids observed this irregular rolling motion.
We may have some future roller coaster engineers in our midst. Students also explored how spheres roll. Using a marble on a foam track, they discovered that they can make the marble roll faster by increasing the slope of the track. They even made the marble roll through a loop.