How does pushing a car that won’t start help start it?
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if the car isn’t starting because the battery is low, what’s missing is actually the initial input from the starter motor. In a manual transmission car, engine and drive shaft are fully connected when the clutch is engaged, so you can start the engine turning by pushing the car with the clutch disengaged (which turns the wheels and thus the shaft) and then engaging the clutch which transfers that rotational energy to the engine. Once the engine is turning over then the power is coming from combustion rather than the battery.
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