ELI5, How am I able to go farther and faster on my bicycle than by walking, considering I have to move the mass of the bike, as well as the loss of energy to friction from the gears and wheels?
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The extra mass of the bike and the friction is still less of a burden than how inefficient walking/running is. Just a smoother motion means a lot less friction. The gears also play a big part, think how tiring it’s to pedal on the wrong gear ratio. When you are running you don’t have a choice. Runing would be more efficient if you could be taking half the amount of steps but they required twice the force.
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