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Chapter 2 | Kinematics 47
Figure 2.22 Breakdown of Graph A into two separate sections.
During the first portion of time (shaded grey) the position of the object does not change much, resulting in a small positive velocity. During a later portion of time (shaded green) the position of the object changes more, resulting in a larger positive velocity. Because this positive velocity is increasing over time, the acceleration of the object is considered positive.
Figure 2.23 Graph B of Position (y axis) vs. Time (x axis).
As in case A, Object B is continually increasing its position in the positive direction. As a result, its velocity is considered
positive.
Figure 2.24 Breakdown of Graph B into two separate sections.
During the first portion of time (shaded grey) the position of the object changes a large amount, resulting in a large positive velocity. During a later portion of time (shaded green) the position of the object does not change as much, resulting in a smaller positive velocity. Because this positive velocity is decreasing over time, the acceleration of the object is considered negative.
