Sometimes it appears that a bowling ball slides down the alley rather than rolling, while other times it appears to switch rolling directions at some point. Scholars control the bowling ball size, initial rotation, initial speed, and...

What determines which ball rolls the fastest — the weight, the radius, the material, or something else? Scholars select two balls to race down the inclined plane, determining their material and radius. As they race, the simulation graphs...

What is the steepness of a hill before a unicyclist slides down it rather than pedaling down it? The simulation graphs the wheel speed versus the unicycle speed as the rider goes down a hill. Scholars control the mass of the rider,...