I have always wondered what those loud noises are the semi-trucks make as they appear to be slowing down, but I don’t understand how that helps?
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Try watching a Japanese show where they experiment ski jumping different tire size rolling downhill.
Imagine a small round rock pebble (gear), if you roll it down a hill, it wouldn’t be moving as fast.
Now imagine a huge rock boulder, if you roll it down a hill, it will pick up more momentum and speed.
Just think of the rocks as if they’re gears on a semi-truck. That’s why they shift to a lower gear when going down hill to minimize speed.
Also, they shift to lower gears going uphill too. It’s a lot easier to push a small pebble up a hill vs pushing a huge boulder up a hill.
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