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Mechanics of a bicycle
The bicycle itself stays upright through a combination of momentum and the center of gravity being maintained over its wheels. Balance and adjustment of the center of gravity is done through the steering and is much easier to maintain balance at higher speeds. It takes practice for anyone to ride a bicycle as it does factor a lot of internal and external forces acting upon the single system of bike and rider; it is often the practice to teach children at an early age how to ride a bike using first stabilizers (two extra wheels) then practice and a few bruises and scrapes!
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The construction of today’s modern bicycles is around a frame with upright seating. Most feature a truss of front and rear triangles. The front triangle consists of the head tube, top tube, down tube and seat tube. The rear triangle consists of the seat tube, paired chain stays and seat stays. Bicycle gearing allows the rider to adjust to more efficient pedaling speeds over different terrain. The gearing begins with the drivetrain powered by the pedals which turn the shaft and connect to the back wheel by a chain drive. The gearing system allows the rider to shift the chain to different sized rear sprockets which vary the number of revolution of the rear wheel produced with each turn of the pedals. The handlebars at the front of the bicycle connect to the fork on the front wheel which allows rotation of the wheel for direction. Other important differentials within the physical mechanics of the bicycle are the breaking system, suspension, seating, and type of wheels used.