Sorry if I used big words and upset your tummy.kinetic energy

Here is some more reading for you:

http://en.wikipedia.org/wiki/Kinetic_energy

Conversely, it is also the work needed toThe kinetic energy of an object is the energy

which it possesses due to its motion. It is defined

as the work needed to accelerate a body of a given

mass from rest to its stated velocity.

*de-celerate*

a body of a given mass from it's stated velocity to rest.

Oops, used another big word. Here you go:

http://simple.wiktionary.org/wiki/conversely

Kinetic energy, even though there are pretty big word for

pilots, is important to understand because it is a function

of the square of velocity.

Let's take an aircraft of given mass M and approach

at 60 knots groundspeed. The amount of kinetic energy

that we will have to dissipate either via aerodynamic

braking or via heat into the brakes is:

1/2 M 60^2 = 1800M

Now, let's approach at 80 knots - groundspeed. We could

do that either by indicating 80 knots at a density altitude of

sea level - TAS increases with DA - or we could approach at

70 knots with 10 knots of tailwind. Doesn't matter:

1/2 M 80^2 = 3200M

That's an amazing 77% increase in the amount of kinetic

energy that has to be dissipated during the landing rollout.

I know kinetic energy has some big words in it, and it can

upset your tummy, but what you are doing is in fact applied

physics, so understanding a little bit about what you are doing

can keep you out of the CADORs.