Thanks for the replies guys. I made my original question a bit unclear. When I mentioned friction, I meant friction between the person and the bike seat, not the the rolling friction between bike and ground.
From what I understand both of you make sense. Doc Al addressed the idea of there being...
A person is on a bicycle, there are several situations like the bike is at rest, accelerating,etc. The one I'm having most trouble with is when bike is in constant velocity.
For the bike,I have gravity and force of person acting downward, normal force upward, force applied to the right and...