Copied from
https://en.m.wikipedia.org/wiki/Friction
"Friction is a force that opposes or resists the relative motion of solid surfaces, fluid layers, and material elements sliding against each other."
That force is silently but relentlessly present in riding, as well as inside and outside our machines.
The "good" friction is beneficial: what do we do to get more of it?
What do we do to reduce the "bad" friction?
Mention some of the bad and good ways in which friction works in a motorcycle: there are many; possibly more than what some members imagine.
