Energy is the capacity to do work. In science, the term work has a very special meaning. It means that an object has been moved through a distance. Thus, pushing a brick across the top of a table is an example of doing work. By applying this definition of work, then, energy can also be defined as the ability to move an object through a distance. Imagine that a bar magnet is placed next to a pile of iron filings (thin slivers of iron metal). The iron filings begin to move toward the iron bar. We say that magnetic energy pulls on the iron filings and...
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