Motion graphs
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9. Negative slope in a position-time graph

Let´s consider now a more difficult example:

The line is loping downwards to the right. The slope is negative.

Let´s determine the velocity (I.e. the slope) of the object as displayed by the graph
For points (0,5 s , 90 m) and (3,5 s and 30 m)


You can try to calculate the slope for any two other combinations of points, and the result will be the same.

The slope is negative (negative velocity).

Whenever an object or body moves in a positive direction described by the coordinate system, its velocity is considered positive.

Its velocity is termed negative if it goes in the opposite direction.

A

L

C