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Mechanics is about the motion of things. Before we can talk about motion in depth, we need to be able to describe motion and the things which affect it. Objects move, and we talk of how fast they go, that is, velocity. Their velocity changes, so we talk of acceleration. We can think of changes in acceleration, but it turns out (happily) that we rarely need to. Mechanics is concerned mainly with changes in velocity.

In this chapter we look at the fundamental elements of mechanics: force, mass, distance, velocity, and acceleration. Comparatively this chapter has a lot of equations (six that you should memorize) and the least interesting physics. It is an unpleasant way to begin, but it must be done.

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