Name: The One Design Change That Made NASCAR Races Faster
Uploaded: 2021-05-25T02:28:23.000Z
Duration: 5 min 13 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

In 1959, something happened that revolutionized

the introduction of Daytona International Speedway.

Walls that NASCAR's stock cars would drive onto.

Daytona's banks were a whopping 31 degrees,

significantly steeper than the relatively flat

12-degree banks at Martinsville or Occoneechee Speedways.

In the first year of Daytona, stock-car drivers qualified

And today, at the same track, that speed is

in large part because of the steep banks.

Detractors of NASCAR joke that, to finish a race,

To NASCAR fans' chagrin, it's somewhat true.

most of the lap is completed while turning, or cornering.

What critics misunderstand is that it's the turns

each other in the straightaways and think,

"Well, the faster car had more horsepower."

comes largely from the momentum they collect

The winningest NASCAR drivers, then, are the ones

change direction the fastest, pick the best lines,

and apply power at the right times to navigate

the corners better than their competitors.

It's the corners where the races are won.

that an object going straight will keep going

straight until something makes it change direction.

So driving a stock car on a straightaway,

even at 180 mph, would be fairly easy for you or me.

It's turning that presents some challenges.

To turn, a force needs to push the car sideways.

When I twirl the ball in a horizontal circle,

the centripetal force to make the ball curve.

Our stock cars don't have strings attached to them.

The centripetal force needed to move the car left is caused

But at high speed, the force of friction at the tires

alone is not enough to pull the car to the left.

Think about turning sharp circles in a flat parking lot.

The faster you go, the more unsteady the car will be.

With enough speed, the car will slide out.

Taking the first turn at Bristol Motor Speedway

the object feels an equal force in the opposite direction.

So for a stock car on a flat track, the track will push up

with a force equivalent to the weight of the car.

On a banked track, however, only part of the force

So the steep, banked turns let drivers maintain

greater speeds into and through the turns.

NASCAR's banks are for cars going at race speeds.

at Talladega Superspeedway would be enough to slide

In fact, if you or I wanted to take a lap

But you don't need to be a stock-car driver

For heavy vehicles, like trucks and buses,

friction alone may not provide enough force to turn safely,

especially if the driver doesn't slow down enough.

A slightly banked turn, with a gentle grade of, say,

So, for NASCAR, banked turns simultaneously

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The One Design Change That Made NASCAR Races Faster

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