Firstly, Rosella investigated how far different sized objects would roll with all other variables the same. We used ball bearings - large and small. We had to predict which one would roll the furthest. We used a ramp and we made it a fair test with all balls let go from the top of the ramp. After much discussion some of us the thought the larger ball would roll further, some thought the smaller one, some thought they would roll the same distance. It was time to test our predictions. We worked in teams to carry out our experiment a number of times to ensure a valid result.
We think it will be fun to be scientists and experiment at home and roll things on different surfaces around the house!