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Action!

Part of the series Science Tube

  Screen capture from Action!

Summary

Examine forces, what they do and how they can be measured, with this four-section programme for Key Stage 2 science.

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Skateboarder assesses how the various materials used for a skateboard have different relationships with the forces of friction and gravity. Some help to reduce friction, others help to increase it.

Parachute Jump looks at skydivers, investigating the forces in action before and after the canopy is opened.

Pedal Power investigates where the force comes from to push bicycle pedals and make it move. This section goes into the lab to see a chicken leg being dissected to examine muscles in more detail.

Finally, Sliding on Snow shows a primary class the forces of gravity and friction when snowboarding and tobogganing.

 
 

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    • Friction
      6 November 2008 - 22:32

      There is an incorrect fact in this video.
      The surface area of the shoes does NOT affect the friction between the surfaces.
      Although a larger area of contact between the shoe and board would create a larger source of frictional forces, it also reduces the pressure between the two surfaces for a given force holding them together. Since pressure equals force divided by the area of contact, it works out that the increase in friction generating area is exactly offset by the reduction in pressure; the resulting frictional forces, then, are dependent only on the frictional coefficient of the materials and the FORCE holding them together.
      The second law of solid friction states that "the frictional force is independent of the area of contact of the given surfaces when the normal reaction is constant".