Eli5: Why did we invent wheels for cars instead of legs? Wouldn’t cars with legs be able to manoeuvre around uneven lands easier?
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It takes more energy to move legs than it does to move wheels. It takes some energy to spin the axel which spins the wheel but, even after cutting off the source of energy the wheel will continue to spin as it’s gradually slowed by friction. Legs however, require a constant source and once it’s stopped they will fail to move. You can test this yourself by running and then freezing your legs and you will likely find that you fall immediately to the ground. Then you can take a bike and lock the handle bars in place before giving it a push and you’ll notice that it travels a ways before it slows and tips over.
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