Definition:Energy

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Definition

Energy is a property of physical bodies which can be defined as the ability to do work.

Like time, it is difficult to define exactly what energy actually is.


Symbol

The usual symbol used to denote the energy of a body is $E$.


Dimension

The dimension of measurement of energy is $\mathsf {M L}^2 \mathsf T^{-2}$.

This derives from its definition as:

${\text{Force} } \times {\text {Distance} }$


Unit

The unit of measurement of energy is the joule $\mathrm J$:

$1 \ \mathrm J = 1 \ \mathrm N \ \mathrm m$

where:

$\mathrm N$ denotes the newton
$\mathrm m$ denotes the metre.