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#### 自行车的反直觉物理

The Counterintuitive Physics of Turning a Bike

If you’re 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

you’re 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 you’re 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, you’ll 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 you’ll 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.