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Moreover, flywheels leak energy fairly quickly and affect a vehicle's steering through the gyroscopic effect. Wind energy is used by sailboats and land yachts as the primary source of energy.
It is very cheap and fairly easy to use, the main issues being dependence on weather and upwind performance.
Locomotion consists of a means that allows displacement with little opposition, a power source to provide the required kinetic energy and a means to control the motion, such as a brake and steering system.
By far, most vehicles use wheels which employ the principle of rolling to enable displacement with very little rolling friction.
Solar energy is a more modern development, and several solar vehicles have been successfully built and tested, including Helios, a solar-powered aircraft.
Batteries also facilitate the use of electric motors, which have their own advantages.
Despite the fact that humans cannot exceed 500 W (0.67 hp) for meaningful amounts of time, The most common type of energy source is fuel.
External combustion engines can use almost anything that burns as fuel, whilst internal combustion engines and rocket engines are designed to burn a specific fuel, typically gasoline, diesel or ethanol.
It is essential that a vehicle have a source of energy to drive it.
Energy can be extracted from external sources, as in the cases of a sailboat, a solar-powered car, or an electric streetcar that uses overhead lines.