Smaller mowers often lack any form of propulsion, requiring human power to move over a surface "walk-behind" mowers are self-propelled, requiring a human only to walk behind and guide them. The most common self-contained power source for lawn mowers is a small (typically one cylinder) internal combustion engine. The blades may be powered by manual force, with wheels mechanically connected to the cutting blades so that when the mower is pushed forward, the blades spin or the machine may have a battery-powered or plug-in electric motor. The height of the cut grass may be fixed by the design of the mower, but generally is adjustable by the operator, typically by a single master lever, or by a lever or nut and bolt on each of the machine's wheels.
A lawn mower (also known as a mower, grass cutter or lawnmower) is a machine utilizing one or more revolving blades (or a reel) to cut a grass surface to an even height.
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