The mechanical power that motors and engines produce must be converted to work by wheels, propellers, nozzles, or similar means. Aside from converting mechanical power into motion, wheels allow a vehicle to roll along a surface and, with the exception of railed automobiles, to be steered. Wheels are ancient technology, with specimens being discovered from over 5000 years ago.
Energy can be extracted from exterior sources, as within the circumstances of a sailboat, a solar-powered automobile, or an electrical streetcar that uses overhead strains. Energy can also be saved, provided it may be converted on demand and the storing medium’s energy density and energy density are adequate to satisfy the vehicle’s needs. In 2002 there were an estimated 590 million vehicles and 205 million bikes in service in the world.
The major sources of friction are rolling friction and fluid drag (air drag or water drag). When needed, the vitality … Read More