1D15.17 – Ball roller
This demonstration illustrates how the ball has no “memory” of its initial direction of travel. We see the movement of the ball as it leaves the roller is perpendicular to the initial direction of travel.
velocity
1D15.20 – High road low road
Although the total potential energy converted to kinetic energy is the same for each ball, the ball on the “low road” has a higher velocity for longer, and will thus reach the end first.