The ability of a force to produce a greater or lesser rotation effort (or torque),
depending on its distance from the fulcrum, is put to use in the lever principle.
Using a long " lever arm ", a very heavy stone placed close to the fixed point
(fulcrum) may be lifted effortlessly.
Of course, this exercise only appears to be magic, in reality, the lever arm travels
further than the stone due to its length and the total force applied by the operator
is the same as if he had moved the stone directly. Nevertheless, the force required
for this operation is effectively lower!

Finally, although it is true that with a fixed point and a sufficiently long lever arm
it is possible to pick up the entire planet (Archimedes), the fact remains that we
would have to find a lever arm strong enough to resist this force without
breaking…