The chain and the axles of the wheels are your main enemies as far as friction loss. (Tire pressure issues follow.) Yes, there are a handful of other things that "suck power" from your efforts, but a new or only lightly worn chain (that is clean and properly lubricated) and a set of clean and properly lubricated and "set up" wheel bearings (for the non-cartridge types) is the first place to start work. Make sure your tires are pumped up all the way. Get advice on pressure, but know that more is better as far as friction loss. High pressure tires suffer less friction loss with the road than the same tire that is under inflated. If all else fails, read the specs on the wall of the tire. You have a lot of control over these issues. Riding clothing and technique will also help, but ask the bike shop folks about this. Do some reading, too. A link is provided to a powerhouse bike guy who has spent a lot of time taking what he knows and posting it on his site for you to read for free. Take advantage of it.
The brake pads of a bicycle are specifically designed to increase friction against the wheel to slow the bike when they make contact with the rim.
Brake pads are usually made of rubber compounds and are often etched with a pattern. This gives them a very rough surface which increases friction even further with the rim when they are applied.
Friction is needed particularly where the tires meets the ground, in the brakes, on the pedals, and on the saddle. If there wasn't any friction there, you'd slip.
And also everywhere where one part of the is supposed to be firmly mounted to another part, like between frame and seat post, fork and stem ASO. No friction there, these parts would slip.
One place where friction isn't wanted is in the bearings. Bearings you want to move as easy as possible.
You could argue that friction is important in most aspects of the bicycle. For one, friction between the bike tires and the ground allow the bike to move forwards and backwards, and to stop. Without friction between the various gears and the bike chain, they wouldn't move very efficiently when you pedaled. Friction between your foot and the pedals is also necessary, or else your foot would continually slip off. You could even argue that it is friction keeping the various screws and bolts in place.
Where the bicycle tyres meet the road surface.
Parts that move WRT each other need to have low friction. Pedal vs pedal axle. Wheel axle vs hub for instance.
Apart from the necessary friction between a tyre and the road surface, friction is very useful when the cyclist pulls on the brakes to either slow down or come to a halt.
bearings and lubrication
See in the picπ
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.
The brakes! And the tires (no friction = no traction).
The bearings
By creating friction between a moving part and a stationary part.
In the bearings that go between the stationary part - the axle, and the rotating part - the hub.
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.
Depends what you want to increase/decrease friction on. If is like a weight on the floor.. Then to increase the friction all you have to do is increase the weight, To reduce it you either reduce the weight or get a smoother surface, or maybe a cloth in-between the floor and the weight.
A bike lane is another term for a bicycle lane or cycle lane - a part of a roadway designed for use by cyclists.
pedal
A bicycle lane is a part of a roadway designated for use by cyclists.
No, that is why there are so many parts.