A race between a ball, hollow and solid cylinders
Three round objects are at the top of ramp: a solid ball,
a solid cylinder, and a hollow cylinder. They are all made out of the same material,
have the same radius, and have the same mass.
Starting at the same point on the ramp,
they are allowed to roll down. Here's the question: Which one will make it down first?
Second? Last? Or will they all arrive at the bottom at the same time?
What do you think? What order will they arrive at the bottom of the ramp?