Friction. D. Crowley, 2007. Friction. To understand what friction is, and how this affects movement. What is friction?. Rub your hands together quickly - what do you notice? This is first hand experience of friction!. Riding your bike.
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D. Crowley, 2007
Friction between two surfaces
Friction increases as speed does
Air resistance - example of friction
Some surfaces limited the speed the block moved at, due to much greater frictional forces