What is the Energy in one kilogram magnet as compared to energy in a gravity mass?

Answer 1

This is a nonsense question without more information.

Newtons Law of Universal Gravity (see http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/circles/u6l3c.html ) says that the FORCE due to gravity it proportional the masses and the distance between them. FORCE is not ENERGY. ENERGY is the ability for the FORCE to act over a distance and produce WORK. On earth since gravity is nearly constant the ENERGY (Potential Energy) is mass*gravity*height or the weight over the distance it can drop.

Magnets - first off the strength of the magnet is measured in Teslas or Gauss (see http://www.coolmagnetman.com/magflux.htm ) and the strength of the magnet drops off dramatically over distance. If you ever played with a magnet it might be able to move an object an inch away but move the magnet two inches away and it can't. It all depends on the flux (strength) of the magnet and the distance to the object. In most cases the forces are weak.

Whats makes this a nonsense question is the word energy. There might be energy (the ability to do work) in a magnet but the intensity must be known and really what you are asking is the comparison of the ability to generate force.

Gravity for the most part wins.