A speed-time graph shows how the speed of an object varies over a period of ____. Speed is shown on the ____ axis, time is shown on the ____ axis. If the line is going up, the speed of the object is ____. This shows that the object is ____. If the line is going down, the speed of the object is ____. This shows that the object is ____. If the line is horizontal, the speed of the object is remaining ____. Constant speed means ____ acceleration. In summary, the ____ (slope) of the line tells us the acceleration of the object. We can calculate the distance the object has travelled by finding the ____ under the line. We often have to do this in sections, finding the areas of rectangles and ____. Once we know the total distance travelled, we can calculate the average speed of the object. We use the usual formula: Average speed = (total distance) ____ by (total time). A speed-time graph does not tells the ____ the object is travelling in.

4. Speed-time graphs

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