Answer:
One of the most obvious effects of friction for students is that it can lead to the gradual wearing away of things; this can be seen in examples like the uneven soles of our shoes, balding bicycle tyres and the deliberate action of rubbing sandpaper on a surface. Experiences of trying to walk, roller skate or ski on slippery surfaces such as ice or snow promote an understanding that getting moving and/or changing direction are both difficult to do in environments where friction is reduced. Friction is frequently portrayed in the popular media as having a ‘bad’ effect and as something to be reduced or eliminated (for example by using friction reducing oils).
