Tires, grips, pedals and brakes needs to have high friction, while all rotating parts needs to have low friction.
invention of bicycle
yes, the bicycle is an invention
a bicycle for transportation
Between its invention, and into a few years after the invention of the Safety Bicycle.
1817
The brakes! And the tires (no friction = no traction).
In the bearings, where you want as little friction as possible.
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.
The resistance of one surface to the motion of another surface rubbing over it is called friction. Friction is caused by the interactions between the molecules on the surfaces and can be influenced by factors such as the texture of the surfaces, the force pressing the surfaces together, and the presence of lubricants.
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
The invention of the multi-speed bicycle increased the usefulness of the vehicle. It made it easier to pedal up hills giving it much more range.