Answer to Question #90069 in Mechanics | Relativity for Joshua Majani

Question

Friction is necessary evil. Discuss

Answer 1

What is evil? Something that worries us. Indeed, when a skateboarder or a bicyclist fall, they are really concerned about friction and roughness of the surface. On the other hand, without friction they couldn't do all their incredible stunts. Little friction is crucial in rotating mechanisms such as watches, bearings, gears and so on. However, high friction is the most important thing for trains, trucks and other pulling machines as well as for people who walk and climb, especially for elderly ones. In philosophy this phenomenon is called dialectical materialism. Many properties of different things may be useful on the one hand and distracting on the other.