We wanted to investigate which material would be best to make a car go further. We predicted that the wooden ramp would be the best because it was smooth. We talked about the properties of different materials. We thought about forces such as gravity and how friction would make all the cars slow down and stop eventually. We made sure that our investigation was a fair test by using the same car, same height ramp and the same sized ramp each time. We were surprised to record that the ramp made of sandpaper was the best for making the car go the furthest. We then looked at other cars and bikes and saw that many have bumpy tyres for grip. We concluded that the sandpaper gave the cars grip which allowed them not to slide on the ramp and go further.
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