without a direction. www.erikthered.com/tutor pg. 2 SAT Subject Physics Facts & Formulas For example, velocity is a vector (represented by a boldface v) and is given by a number (say, 50 m/sec) along with a direction (say, 30◦ north of east). Mass (m) is just a number (say, 80 kg), for which a direction doesn’t make any sense, so it is a scalar. We can define components of a vector as the projection (or “shadow”) of the vector on the x and y axes, as in the figure below. y vy θ vx x v Using…
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