Speed - A measure of how far your travel in a certain amount of time, Friction - A force that slows a moving object down:, Acceleration - How quickly speed increases or decreases, Kilometre - One thousand meters, Horizontal - The line on a distance-time graph when the object is not moving, Diagonal  - he line on a distance-time graph when the object is moving at a constant speed, Average speed - he overall distance travelled divided by overall time for a journey, Relative - The motion of a moving object with respect to another moving object:, metres per second - A measure of speed with the units ‘m/s, Journey - A trip where a distance is covered in a certain amount of time,

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