Give examples of practical application of static friction.

Static friction comes into play when

1. Tyres gain grip which is also known as the attraction between the drive wheel and the road surface.

2. Consider a person climbing a 'chimney', which is a gap between two stone walls, with no hand holds or grips, but plenty of friction as shown in the figure below.

Here the friction is increased by increasing the normal force between the person and the walls. As the normal force increases friction also increases as

frictional force = friction coefficient × normal force