chapter 18Mechanical Comprehension
Describing Motion
Motion is a change in position. There are three aspects to describing motion: displacement, velocity, and acceleration. Displacement (Δd) is a change in an object’s position from some reference point. For example, if you walk 10 m forward, then you have changed your position by a distance (10 m) in a direction (forward) from some reference point. Note that displacement has both a magnitude (i.e., how far you’ve gone—distance) and a direction (e.g., forward—often, positive is used to denote going away from the reference point, while negative is used to denote coming towards the reference point). ...
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