Why Do Planes Need to Go Fast Before They Can Take Off?

What Crafty Clover says in this video

Intro

Hi there, curious minds! I'm Crafty Clover! Let's discover something amazing. Why do planes need to go fast before they can take off?

The Big Idea

A plane cannot just jump into the sky. It has to roll down the runway first. It needs to get going fast!

Speed Makes Lift

Step one: speed makes lift. Lift depends on how quickly air moves over the wings. On the runway, the plane has to roll fast enough that its wings make enough lift to match its weight.

How Fast

Step two: how fast. For a big airliner this is about one hundred sixty to one hundred eighty miles per hour. That is why runways are so long.

Lift the Nose

Step three: lift the nose. Once the lift is large enough, the pilot lifts the nose. Then the plane rises into the air.

A Closer Look

Let's take a closer look! The plane rolls down the runway. Its speed grows. The wings make more lift. Up it goes!

Quick Facts

Quick facts! A big jet may use more than two miles of runway on a hot, heavy day. Big airliners need about one hundred sixty to one hundred eighty miles an hour. Lift must match the weight. Then the plane can leave the ground.

Think Like a Scientist

Now, think like a scientist! Run with a sheet of paper held flat in front of you. Walk, then jog, then run. Watch what the paper does. Does it lift more when you run faster? Share your results with someone you love.

Outro

A plane needs to roll fast down a long runway so its wings make enough lift to match its weight. Science is amazing! Keep asking questions! There is always more to discover, and you are a great science explorer! Crafty Clover can be found on Amazon Books, Google Bookstore, and Apple Books. Available for purchase or download! Bye for now!