How does pushing a car that won’t start help start it?
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Usually to start a car, a little electric motor spins the engine until it has enough strength to spin by itself. This needs a lot of energy from the battery, so a dead or low battery cannot start the car.
However, if the engine is connected to the wheels (referred to as being ‘in gear’), you can spin the wheels to spin the engine, instead. Pushing the car then spins the wheels which spins the engine which can then start and spin by itself.
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