I have to do an important experiment tomorrow. In physics, we have this setup: We have a ramp (we don't know how long, we dont know the angle), and we put it on a normal counter top with the 'exit' end up to a meter from the edge. We place a camera film capsule off the edge of the table, and we have to try to calculate it just right so the ball falls in. Since I don't know the exact measurements, I can say this: The ball will be a solid metal ball, probably about 1/2 the volume of a ping pong ball. We will be using a normal countertop and a table probably about 1m high. I don't know the exact measurements of any of these, but to be prepared, I pose you this question(s): What formulas will I have to know? About how much should I take counter friction into account?