eli5 What does a clutch on a car do?
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The clutch basically acts as a middleman between gears. It works by disengaging the gears in the transmission when you step on the pedal, giving you and the transmission a chance to select the new gear and ensure that the gear teeth are aligned before engaging the transmission again when you step off the clutch. Most modern cars have syncro systems that allow you to slot into a new gear at any engine RPM speed; on older cars that don’t have this, you had to match the RPM with the gear you wanted next: if you were shifting down, you would have to rev higher to match the engine speed to the new shorter gear, and vice versa
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