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
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.
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.
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.
Because friction stops momentum of force from moving the bike