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  • If youre riding a bike and want to turn right, you might think that you should turn

  • the handlebars to the right. However, that’s wrong.

  • Because, unlike a car where turning the wheels merely changes the direction the car is pointed,

  • turning the front wheel makes a bike lean. When you turn the bike wheel to the right,

  • the wheel goes to the right, right out from under you and the rest of the bike. So now

  • youre leaning to the left, and the force on the bike from the ground will be directed

  • to the left, and a leftward force, of course, makes you go to the left. Since physics seems

  • determined that youre going left, you’d probably better just give in and let the handlebars

  • turn to the left, too.

  • And that’s how you turn left on a bike – by first turning right. If you really wanted

  • to go right, you should have started by counter-steering to the left.

  • Once you finally get yourself into a right turn, youll also need to work to keep yourself

  • in the turn, since most bikes and motorcycles have a tendency to automatically stabilize

  • and straighten out on their own. This happens because a right-leaning bike automatically

  • steers itself even farther to the right to get the wheels back underneath its center

  • of mass, so youll actually need to apply a slight torque to the left to keep the wheels

  • from turning too far to the right.

  • Yes, it’s counterintuitive: to turn right on a bike you turn left, then keep trying

  • to turn left while leaning and turning right. Bikes

  • are weird.

If youre riding a bike and want to turn right, you might think that you should turn

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B1 中級

自転車を回すときの逆説的な物理学 (The Counterintuitive Physics of Turning a Bike)

  • 287 15
    Wayne Lin に公開 2021 年 01 月 14 日
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