In the bearings, where you want as little friction as possible.
The brakes! And the tires (no friction = no traction).
Yes, as the bicycle rolls down the hill, there is still some friction present between the wheels and the surface of the hill. This friction helps to slow down the bicycle's descent and eventually bring it to a stop.
Bicycle friction can impact the overall performance and efficiency of a bicycle by causing resistance that makes it harder to pedal. This can result in decreased speed, increased energy expenditure, and reduced overall efficiency.Reducing friction through proper maintenance and lubrication can help improve performance and efficiency.
The bearings
Because friction stops momentum of force from moving the bike
Friction and leverage.
The brakes and the tire treads.
The net force on a bicycle is zero when the forces pushing forward (such as pedaling and friction) are balanced by the forces resisting motion (such as air resistance and friction). This typically occurs when the bicycle is moving at a constant speed on a level surface.
There are several force transitions going on in the linkage, but in the actual brake you are using friction to turn speed into heat.The most important one is friction, but apart from that there's a lot of mucking about with mechanics in order to translate the motion by the hand at the lever into something capable of slowing down a wheel.There are several forces needed to make a bicycle brake work IRL. But I assume the one you're asking about is FRICTION.
Brakes are meant to have a lot of friction and it's useful.
If there is no friction, the bicycle's speed will remain constant due to inertia. Once set in motion, it will continue at the same speed unless acted upon by an external force.
The force that makes bicycle brakes work is friction. When the brake pads press against the wheel rim or disc, friction is created, which slows down the rotation of the wheel and ultimately stops the bike.