Question

a) Where on a bicycle do you want to reduce friction to a minimum? How is it done?

b) Where on a bicycle do you want friction?

Answer 1

A) Undesirable friction exists between the connections of the tires and the frame as well as the pedals. Lubricating fluid is applied to reduce this.

B) Desirable friction exists between the tires and the road, helping the bike grip the road.