Thread: A Plane Problem
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Unread 20 Dec 2006, 17:08   #40
Tomkat
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Re: A Plane Problem

Quote:
Originally Posted by MrL_JaKiri
Lets call the force from the engines E.

Let us call the (constant in this example) friction force F.

The net force when taking off is E - F.

The net force when landing, from the wheels alone (no breaks, or flaps or whatnot) is F.

Now, let us assume that the plane doesn't need breaks or flaps when landing. It just stops of its own accord.

In this case E - F = F

E = 2F.

As the treadmill is moving at the exact speed, then it is exerting exactly the same force as the engines are thrusting, so surely E = F.
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