Perpetual motion.
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Mechanical energy is the sum of potential energy and kinetic energy, the energy associated with the motion and position of an object. It is the energy that is generated by an object that is performing work or a job.
The exact relationship is given by Newton's law of universal gravitation: F=G*m1*m2/R**2, where G is a constant that applies to all matter; m1 and m2 are the masses of the two attracting bodies, respectively; and R is the separation between their centers of gravity.
A swinging pendulum has potential energy at each end of it's travel (when it stops momentarily) This energy is converted to kinetic energy as it swings down and back to potential energy as it swings up the other way.
A lever is a very useful tool that lets us exchange weight for distance. For example (theoretically) if you had to move a 200 pound sack into a car, but couldn't lift it, you could divide it into 8 parts, each being 25 pounds, and move each one individually into the car. It would be easy, however it would take more distance (lifting into the car 8 times instead of 1)
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