Eli5 what does the transmission on a car do and how does it work?

Question

Eli5 what does the transmission on a car do and how does it work?

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Answer 1

You know how, on a ten speed bike, you need to change gears to optimize the amount of work you’re doing to the speed you’re going. The transmission in your car does approximately the same thing, but using weights and fluids and gear rotational speed.