For our Science, we have been looking at forces. We learnt about a force called friction and how it effects the movement of objects. We wanted to find out which materials made the car go further. We used ramps which had different materials on. We let the car down the ramp and then measured how far the car went when it got to the floor. We had to make sure our test was accurate and fair. To ensure our test was fair, we only changed on variable- the different ramps. It was clear to see which materials had the most friction.