Doctor Knowles and Professor McCork get to the bottom of some of life's most massive science questions. Knowles and McCork ask, how do aeroplanes fly?
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STUDIO BELL RINGS
Oh, deary me. I wonder where McCork is? It's getting late.
Colin, did you know that scientists in Europe have
invented a plane which runs completely on solar power? How cool!
That's amazing, Doctor.
I wonder what sort of fuel Professor McCork is running on today.
HE MURMURS APPRECIATIVELY
Ten seconds to air, everyone.
Oh, excuse me.
-This is Brain Freeze.
With Dr Knowles...
..and Colin, the floor manager.
Hello, everyone, and welcome to Brain Freeze.
And let's reveal...
Today we're asking...
Ah, do we have to talk about this, Dr Knowles? I hate flying.
It's OK, Professor. Relax.
There are four main factors involved in getting a plane off the ground.
Please tell me none of them is luck.
Thrust is the force that moves the aeroplane forward.
It is generated by the plane's engines or propellers
and overcomes the drag force present in the air.
Remember, air isn't nothing.
It's a mixture of gases that the plane has to push through.
So, it's like riding a bike in the wind blowing in your face or
-Something like that, Professor.
Ah, see, I'm not just a pretty face!
But before we take off, a quick word from our sponsors. Stay tuned.
And we're clear! Are you looking forward to your trip, McCork?
I am indeed. New York city.
The World Hot Dog Eating Championships.
-Months of training finally about to pay off.
It's been so long since I've had a holiday.
The thing is, I've no idea how I'm going to get there. I hate flying.
-Well, they say it's perfectly safe.
-I was thinking maybe I could drive.
CAR HORNS TOOT
Ah, no, strike that. Maybe I could swim?
-Not after eating all those hot dogs, Professor.
-Yeah, true enough.
Here, I could try taking one of them jet skis.
Help! Oh! Help!
Well, I'm sure you'll figure something out, McCork.
Places please, everybody.
Just in from Frank.
If thrust makes the plane go forward, what makes it go up?
Aeroplane wings are designed in a special way.
They're curved on top and flatter underneath.
The air moving over the curved part of the wings flows faster than
the air at the bottom, creating a difference in pressure
resulting in an upward lift force.
This lift force combines with the forward thrust of the engines to
-overcome the drag force of the air.
But there is one other force at work - gravity.
Gravity is the special force that pulls all of us down
on the Earth's surface.
When the upward lift force created by the wings is greater than
the force of gravity pulling the plane back to Earth,
it's time to fasten those seatbelts!
So, now you know how an aeroplane flies.
Lift has to overcome gravity and thrust has to overcome drag.
And I have to overcome fear.
That's all for today's show. See you next time.
And we're clear. Phew! Great show, guys.
Maybe I could ride a whale over or jump on a dolphin's back or
-maybe I could get a TARDIS like yer man, Doctor Who.
-Oh, look at this.
-Cheapskate Airways. Flights to New York for 25.
-Ah, that's magic.
-Book me in, so, Doctor.
-I thought you were afraid of flying?
-Well, a bargain's a bargain, Colin.
Doctor Knowles and Professor McCork open the studio doors for an explosive episode of the show that tries to get to the bottom of some of life's most massive science questions.
Knowles and McCork ask, how do aeroplanes fly? Meanwhile backstage, McCork confesses to a fear of flying and tries to find another way to get to New York for the World Hotdog Eating Championships. What could possibly go wrong?