Lesson: Chapter - 7
Work, Energy, and Power
There are a number of technical terms in physics that have a nontechnical equivalent in
ordinary usage. An example we saw in the previous chapter is force.
We can talk
about force in conversation without meaning a push or a pull that changes the
velocity of an object, but it’s easy to see that that technical definition has
something in common with the ordinary use of the word force.
The same is
true with work, energy, and power. All three of these words
have familiar connotations in ordinary speech, but in physics they take on a
technical meaning. As with force, the ordinary meaning of these words provides
us with some hint as to their meaning in physics. However, we shouldn't rely too
heavily on our intuition, since, as we shall see, there are some significant
divergences from what common sense tells us.
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The related phenomena of work, energy, and power find their way into a good
number of questions on subject test Physics. And energy, like force, finds its way
into almost every aspect of physics, so a mastery of this subject matter is very
important. The conservation of energy is one of the most important laws
of physics, and conveniently serves as a tool to sort out many a head-splitting
physics problem.
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