The bearings
In the bearings that go between the stationary part - the axle, and the rotating part - the hub.
The brakes! And the tires (no friction = no traction).
By creating friction between a moving part and a stationary part.
Any bicycle part that makes contact with another part but needs to move to function must have friction reduced. The wheels bearings, steering head, pedal bearings in both the hub and pedal, and the chain links all are designed for minimum friction but they also need lubricant.
Same as on a car. Applying the brakes means that something stationary is pressed against a moving part. This generates friction, which turns speed into heat.It produces friction, because when the brake touches the rim of the bicycle, the bicycle slows down. (thats called friction) And after a while the bicycle stopsA stationary part is brought into contact with a rotating part. The resulting friction slows the bike down.
A bicycle has high friction at the brakes, first and foremost. Then at places where the rider holds on to the bike, Grips and pedals. Between tires and road.
It is on smooth surfaces because the amount of friction is less.
pedal
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A bicycle lane is a part of a roadway designated for use by cyclists.
Since you eat it on small amount, it can be part of a diet, as it gives you pleasure.
a small or tiny part, amount, or proportion of something