An explanation of friction using a bobsled as an example. A force is needed to start an object moving and to stop it once it is moving. A force can make an object speed up or slow down. Friction is a force generated when surfaces move across each other.
This clip could provide a starting point to understanding friction. Pupils could investigate and create their own bobsleigh using different materials to find out which combination of materials make the best bobsleigh.They could then run their own bobsleigh championships to find out which design was the most effective. They could also test them on different surface boards to see if that would change the outcome.