Eli5: How does changing gears in cars enable them to travel faster compared to using the lower gears at the rpm?

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Me monkey brain tried to do a google search on my own… me monkey brain didn’t understood a thing…me monkey brain need help

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Anonymous 0 Comments

Your transmission (the thing with gears in it) connects your engine to your wheels, but not directly. It uses gears to make the side connected to the wheels spin faster or slower than the engine.

Try picturing this in your head:

In 1st gear, your engine is connected to a small gear and your wheels are connected to a big gear. The small input gear (your engine) has to spin around lots of times (7-15ish times depending on the car) to make the big output gear (and your wheels) turn once.

In your highest gear, your engine is connected to a big gear and your wheels are connected to a small gear. So when the bigger input gear (your engine) spins once the smaller output gear (your wheels) will spin a few times. (In reality your engine will have to spin 2-3 times to make the wheels move once, there’s another gear reduction involved which is why it’s not a number lower than 1.)

If you’ve ridden a bicycle with gears before it’s the exact same concept but with the speed you pedal instead of engine rpm. That might also make it easier to understand.

Did this answer your question correctly? Your wording was a bit vague but it seemed like this is what you were asking.

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