Method:

1.Nail nails to board slightly more to one side, leave fair amount of space inbetween

2.Attach rubber bands to nails according to amount of space inbetween

3.Put books under side with nails until the board is tilted at a 30 degree angle, make sure on flat surface and plenty of space infront of nailed side

4.Put marble infront of rubber band and pull back, mark where pulled back to lets marble roll down with rubber band when pulled back

5.Let go of rubber band, measure and record the distance from the board

6.Put marble infront of rubber band and pull back to mark, let marble roll down with rubber band when pulled back

7.Let go, measure and record distance and repeat 3 more times

8.Change angle to 45 degrees and repeat the method of flinging the marble 5 times

9.Change angle to 60 degrees and repeat the method of flinging the marble another 5 time

10.Compare results