Friction is created when two surfaces rub together; for example, when a car tyre moves over the road surface. Friction can create heat and smoke can often be seen coming from the tyres of racing cars. The friction between the road surface and the tyre causes the tread in the tyre to wear down. Placing something on a spinning wheel will cause friction to slow the wheel down; this is how brakes work.
This clip could be used when learning about friction between two surfaces and investigations into how by using different materials objects can be caused to speed up or slow down. It shows how lots of friction can cause heat and materials to wear away. It could lead to investigations into the best materials to use for slowing objects down. The pupils could investigate which shoes in their group have the best grip by devising some fair test experiments to explore their theories, possibly using devices designed to pull the shoes across different surfaces or simple sloping ramp tests.