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The motor vehicle engine is basically a device for ( 1 ) the internal energy stored in its fuel into ( 2 ) energy. It is classified as an ( 3 ) combustion engine by virtue of this energy conversion taking place within the engine ( 4 ). Since the ( 5 )" energy" implies the capacity to ( 6 ) work, the engine is thus able to ( 7 ) the vehicle along the road and, within limits, overcome unwanted opposition to its ( 8 ) arising from rolling ( 9 ) and air drag. To facilitate this process the engine is combined with a( 10 ) system.