During the power (expansion) stroke, in which direction does the piston move?

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Multiple Choice

During the power (expansion) stroke, in which direction does the piston move?

Explanation:
During the power stroke, the highly pressured combustion gases push the piston downward—from top dead center toward bottom dead center. This expansion work drives the piston down and turns the crankshaft via the connecting rod, delivering the engine’s power. The piston moves along the cylinder’s axis, so downward is the correct direction in a typical engine. (The other strokes involve opposite or different motions along that axis: compression moves the piston up to compress the mixture, intake and exhaust involve the piston moving in the opposite sense to draw in air or expel exhaust.)

During the power stroke, the highly pressured combustion gases push the piston downward—from top dead center toward bottom dead center. This expansion work drives the piston down and turns the crankshaft via the connecting rod, delivering the engine’s power. The piston moves along the cylinder’s axis, so downward is the correct direction in a typical engine. (The other strokes involve opposite or different motions along that axis: compression moves the piston up to compress the mixture, intake and exhaust involve the piston moving in the opposite sense to draw in air or expel exhaust.)

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