Forklift Lifting Moving
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Forklift Lifting Moving
Modern Conservation of energy theory : Energy can not be created But destroyed , and it can be transformed fro?
Modern Conservation of energy theory : Energy can not be created But destroyed , and it can be transformed from one state to another. ,, proof ? , look if we tried to cool the core of the earth basically we will use Huge energy while the core 's temperature remains constant isn't it destroyed 
, another example bring a forklift and move a box 5 tons to a higher lever 3 meters the kinetic energy in the box will change to potential energy due to its position from earth , if you returned back the box by the lift it will lose potential energy and gain back its initial kinetic energy , well so Where consumed the energy of the lift ? , and if you wanna be sure easily know that every day we use tons of petrol fuel and Gigawatt s of different types of energy , isn't that energy destroyed ?
The key distinction is useful energy versus useless energy. The laws of physics do not distinguish between useful and useless, and in that sense, energy can't be created or destroyed.
But useful energy can certainly be converted to useless energy. On a hot summer day you could turn on an electric heater and electrical energy would be converted into heat. What might have been useful electrical energy has been consumed, and no longer exists in that form. But total energy is the same because it has simply changed form from electricity to heat.
When people say energy is lost, or wasted, or used up, they are referring to the usefulness of the energy. The energy itself simply changes form into a less useful one (usually heat).
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