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Science of skiing
Bang Goes the Theory presenter, Dallas, explains how the friction between skis and snow generates heat which melts the snow to create a thin layer of water to act as a lubricant. An Olympic skier then explains the various processes used to create custom made skis with the perfect finish to produce the right amount of friction. The presenter races the Olympic skier before and after the skis are changed, achieving a much better time with the custom skis.
Pupils could question if the two races were a fair test to see how the friction between the skis and snow changed. Note the presenter wears more aerodynamic clothing in the 2nd race. When discussing material properties and how they can be modified to suit a specific application. As a starter when introducing an investigation into frictional forces.
Clip 4 from the Bang Goes the Theory teachers pack. To download the pdf please go to bbc.co.uk/schools/teachers/bang/.
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