Eli5: what exactly is energy?

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Like, i know it’s the ability to do work and all that, but this isn’t what energy is, it’s what energy does. What IS energy tho?

In: Physics

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For humans, energy is an abstract denotation of “how much work can be done”. And by ‘work’, it usually means ‘change’.

The change can be “change in speed over time” and the energy be measured in HorsePower (how much weight can be moved in one second).

It can be a measure of how much change in temperature, the energy in this case can be measure in Calories or Joules (how many degress can be transferred per one gram).

Kinectic energy is basically how much ‘potential’ a moving object has to transfer the velocity to another object. A moving truck has “more energy” so it can apply its energy to change – let’s say, the position of a tree more easily than a moving bicycle does. Or a hot stove can change the temperature of the water more than your warm hand does.

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