There IS air resistance, and it would be most noticeable for the ping pong ball. Because of its small mass, the air resistance (which depends only upon area) as a greater decelerating influence on the ping pong ball.
The ping pong ball also leaves the horizontal channel more slowly (when released from the same height as the other balls) because a larger fraction of the gravitational potential energy is converted to rotational kinetic energy.
I also had another questin to go along with my lab.
If a sponge ball, ping-pong ball, and a metal ball were rolling down the same incline on the moon, which would have the longest range?
I figured that they would all have the same range since there is no air resistance, but I wasn't really sure.
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