Question

The velocity-time graphs represent the motion of four different objects. Identify anyobject that is changing its velocity or accelerating. Check all that apply.

Answer 1

The change velocity over a period is known as the acceleration. In a velocity-time graph, the acceleration is given by the slope of the graph.

Thus, when the slope of the line on the velocity-time graph is zero, that is, when the line is horizontal, the object is not accelerating.

The lines in the last two graphs in the question are horizontal. Therefore, those two objects are not accelerating.

And the objects in the first two graphs are accelerating as they are not horizontal lines and their slope is non-zero.