How gravity causes a perfectly spherical ball to roll down an inclined plane is part of ... The steeper the ramp, the more likely the object rolls; as the ramp flattens out, the more likely ...

RAFA: We need to get some balls moving, we need to get the balls to go, but if like me, you can’t throw the ball then you’re going to roll it down a ramp instead. RAFA: Okay, and another one ...