Energy Transfer

Potential Energy can be Elastic or Gravitational.

Gravitational Potential Energy called "GPE"
is a measure of how far an object can fall.
The higher up it is, the further it can fall and the more GPE it has.
GPE also depends on the object's weight.

GPE = mass x gravity x height.     GPE = m x g x h.

This equation is important!

Since mass x gravity = weight,  GPE = weight x height.
On Earth the force of gravity is 10 N/kg.

For example, the GPE of a rock which has a mass of 75kg
and is raised to a height of 4·0 metres is

GPE  =  75 x 10 x 4·0
= 3000J.

When the object starts to fall, GPE is transferred into KE.

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