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2.3 Analyzing uniform motion
Look at the graphs Representing velocity and displacement for a
on this page. What uniform motion
information can a) Velocity (speed) equal to zero
you infer from these Figure 1 shows velocity vs. time for an object that is stationary (not
textbooks nis edu kz
graphs? Why do we use moving, or ‘at rest’). The velocity and the speed of the object are equal
graphs to represent to zero.
data?
V, m/s
t, s Figure 1
When the object is at rest, its position (displacement, S) and its distance
travelled do not change over time in relation to a stationary observer.
A graph of distance vs. time, if the initial position coincides with the
starting point, is as shown in Figure 2.
S, m
t, s Figure 2
If the initial position of the object has a definite value magnitude,
such as 200 m away from the point of reference (for example, you are
standing still, 200 metres away from the bus stop), the graph of S (m) will
be a straight line parallel to the time axis (t). See Figure 3.
S, m
t, s Figure 3
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