In other words, the velocity-time graph is a straight line. To double the force, I ask the assistant to use two identical scales, hook them both to myself in parallel and pull while trying to keep the ...

Velocity-time graphs show how the velocity (or speed) of a moving object changes with time. These graphs also show if the object is moving at a constant speed or accelerating, decelerating, or still.

From a straight-line graph the gradient can be calculated. The gradient of a distance-time graph is equal to the speed, and the gradient of a force-extension graph is equal to the spring constant.

Consider the following three key questions the next time you see a graph, map or other data visual so you can confidently decide what to do with that new nugget of information.