Fakepilot,
A 737 with 2 engines produces max 50K thrust. But it can lift and hold some 130K pounds. So in this case, you get 80K pounds for "free."
Nope.
Take a look at a crow bar...
I'm sure you will agree that the force that a crow bar can generate is much higher than the force applied? However you need to remember that...
Work done = Force x Distance
The output force may be greater than the input but the output distance is less. The equation you need to understand is...
Force IN x distance IN = Force OUT x distance OUT
or better still..
(Force OUT x distance OUT) - (Force IN x distance IN) = ZERO
An aeroplane is just a crowbar (Lever) in disguise.
Raaaid,
there will be a transformation of the kinetic energy into a very slight down and lateral thrust first and then a bigger up and lateral thrust the lateral thrust
But that matter not a bit.
As I said to Fakepilot...
The equation for work done includes distance (and the equation for energy include terms for distance and time). Your explanation ignores both.
If you do the analysis including those you will eventually see that the energy IN is always less than the energy OUT (even if the force/thrust OUT is greater).
A Force or thrust on its own can't be used to do any work. My feet always exert a force on the gound but that doesn't mean I can fly.