Friction can be a car's best friend on a slippery road. If the road is too slippery, the tyres slide or skid. Local authorities monitor roads to make sure they are not too slippery. They measure the friction between the road surface and the car, and the information is sent to the local county council who will fix the road if necessary.

First broadcast:
5 March 2008

Useful for an initial discussion on friction and why we may need high or low friction. This clip could introduce children to how friction is measured in a real-life situation. The children could pretend they are resurfacing the local road network and therefore carry out the ramp experiment with a range of different surfaces in both dry and wet conditions to find the ideal surfaces based on the amount of friction the car has on them.