The Life Saving Bicycles
December 12th, 2009A bicycle is a human power-driven vehicle that has a frame connected with two wheels and that is
driven by a pedal. introduced during the 19th centuries bicycles are known to outdo the
full number of motor vehicles by a ratio of 2 to 1. In many regions of the world, bicycles are the main method of transport. Although
the primary use of the bicycle is as a means of transport, it has developed other uses including recreational activities, fitness actions
law enforcement diligences and competitive sports.
History of Bicycles
Ever since the chain driven model was introduced to the market, the fundamental
design of the bicycle had remained unchanged up to day. But, other advances such as using computers to design
and check the stability have been made to the bicycle from its manufacturing process. Some bicycles are particularly
constructed to adhee to standards of racing, cyclicling on mountains and even for law enforcement. Additionally, the concept of the bicycle has up to a great extent extended its contribution for the development of automobiles by introducing concepts such as ball bearings, pneumatic tires and spoke tensioned wheels.
What to Look for In a Bicycle
Dynamics
of the bicycle is something that should be mentioned to first. Bicycle needs its centre of gravity in order to be in its space. So it reaches this by moving forward
using the steering which provides some balance to the rider. In addition in order to successfully navigate a turn, the combined or total center of mass
of both the bicycle and the rider must lean into the turn. A technique referred to as counter-steering is used to attain this task by directly turning the handlebars with the reaches
or indirectly leaning or slanting the bicycle.
Through both biological and mechanical view points, the bicycle is an highly
competent machine. When
comparing the energy an individual must spend to travel a given distance, the bicycle is stated to be the most efficiently
working self supercharged method of transportation. Nearly, 99% of the energy is expressed to the wheels of the bicycle when a
rider exerts energy into the pedals. Nevertheless when gears mechanisms are used this figure may drop by 10-15%.A rider using a bicycle
experiences air drag or the resistive force that is exerted by air. At higher speeds, significantly greater power outputs are needed to overcome the air drag. When a rider is sitting in an upright position, the
body of the rider accounts for nearly 75% of the total drag practiced by the bicycle and rider combined. Nonetheless, the exerted drag can be importantly
decreased by placing the rider in a supine or a prone position and by covering the bicycle with fairing that is aerodynamic.
The main
features of a bicycle are frame, steering mechanics, seating, drivetrain, suspension, wheels and brakes. Certain bicycles may include optional
mechanics such as gearing which uses several sizes of gears to obtain a mechanical advantage from the bicycle. Using gears a rider can produce a higher power output with a relatively low
power input and thus, increasing the efficiency of the bicycle.