The primary sources of friction are rolling friction and fluid drag (air drag or water drag). When needed, the energy is taken from the supply and consumed by a number of motors or engines. Sometimes there is an intermediate medium, such as the batteries of a diesel submarine. Another frequent medium for storing power is batteries, which have the benefits of being responsive, helpful in a wide range of energy levels, environmentally pleasant, efficient, easy to put in, and easy to keep up.
In plane, air brakes are aerodynamic surfaces that create friction, with the air move causing the vehicle to slow. These are often applied as flaps that oppose air circulate when prolonged and are flush with plane when retracted. Propeller aircraft obtain reverse thrust by reversing the pitch of the propellers, whereas jet plane achieve this by redirecting their engine exhaust forwards. On aircraft carriers, arresting gears are … Read More