science

we tried to change the surface and that made big ones go far and small ones go short and we word test run a small marble and a big marble to see what can happen the problem was that small ones go not far they only went 10 cms so we went to the middle play ground and they went 2 meters and the big ones went 3 meters and we try the wood  down and up down work better then up on grass up worked better at the middle play ground