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Forces - Friction

Today, we carried out experiments involving friction. We made slides of the same height but used different materials: cork, sandpaper, felt, tin foil and paper. We made predictions as to which surface would cause a toy car to travel fast or slow. Which would cause the most friction?

We made it a fair test because we made slides of the same height and used the same toy cars. We used a stopwatch to time the speed the cars travelled down the slide:

Cork             0.46 seconds

Sandpaper    1.60 seconds

Felt              0.68 seconds

Tin foil          1.02 seconds

White paper  0.62 seconds.

We then went back to check whether our predictions were correct.