Conservation of magnatic energy ofa law …

• Law of Conservation of Energy:

According to the law of conservation of energy, energy can only be converted from one form to another; it can neither be created or destroyed. The total energy before and after the transformation remains the same.

Let an object of mass, m be made to fall freely from a height, h. At the start, the potential energy is mgh and kinetic energy is zero. The kinetic energy is zero because its velocity is zero. The total energy of the object is thus mgh. As it falls, its potential energy will change into kinetic energy. If v is the velocity of the object at a given instant, the kinetic energy would be ½mv². As the fall of the object continues, the potential energy would decrease while the kinetic energy would increase. When the object is about to reach the ground, h = 0 and v will be the highest. Therefore, the kinetic energy would be the largest and potential energy the least.

The sum of the potential energy and kinetic energy of the object would be the same at all points. That is,

potential energy + kinetic energy = constant

 or

mgh +1/2  mv² = constant

The sum of kinetic energy and potential energy of an object is its total mechanical energy.