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As with any problem, we must decide what lens/perspective we will look at the problem with. Will it be energy or kinematics? In this case both perspectives will work, although energy is more intuitive.

A *vector* is just an arrow from the origin to a point. It has *magnitude* (how big it is) and *direction* (which way it’s pointing). A variable will have an arrow above it if it’s a vector!

Vectors can be in any number of dimensions

Gauss’s Law is a useful tool for solving electrostatics problems. Instead of computing hard nasty integrals, we can use Gauss’s Law to simplify the computation for nice symmetric cases. The superposition principle claims that, in a linear system, the net response of two or more stimuli is the sum of the responses from those stimuli individually.