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.
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.