Cars are notorious energy wasters. Most cars run on gasoline. Th e chemical energy stored in gasoline is transformed into motion in the
engine. Engine motion is then transferred to the drive wheels, making
the car move.
In a typical engine, only about one-quarter of the chemical energy
in the gasoline is converted into mechanical work by the engine. By
the time that energy is transferred into the drive wheels, less than
20 % of the gasoline’s energy is actually used to move the car. Th e
remaining energy is lost through such things as hot exhaust gases
(fumes), heating the water in the car’s cooling system, overcoming
friction in the car’s moving parts, vibration, and sound (Figure 2).
Make a list of other machines that have energy loss? What energy is lost?