Hi I would like to calculate the angle and distance sand will travel after it has been impacted by a rotating object such as a rotating brush (like those street sweepers). Example if were to take a spinning bike tire (ignore tread) and spin it up to let's say 100 RPM and lowered it until it made contact with the sand. How could i determine the angle (most important) the sand will be thrown upwards and the distance it will travel. My Problem I have a system that sweeps sand up into a bucket. My problem is that a lot of the sand goes up and falls back into the brush system instead of going at an angle of let's say 135° into the bucket. This picture shows my setup. The red arrow is the angle I must achieve to get the majority of the sand in the bucket.