scalar quantity - A quantity that has a magnitude (size) but not a direction. Examples include mass, distance, energy and speed., vector quantity - A quantity that has both a size and a direction. Examples include force, velocity, displacement, momentum and acceleration., magnitude - The size of something, such as the size of a force or the measurement of a distance. It can be measured on a scale., distance - How far something has travelled. Distance is a scalar and has no direction., displacement - The distance travelled in a particular direction. Displacement is a vector, distance is not., speed - A measure of the distance an object travels in a given time. Usually measured in metres per second (m/s). It is a scalar quantity., velocity - The speed of an object in a particular direction. Usually measured in metres per second (m/s). Velocity is a vector, speed is not., average speed - The speed worked out from the total distance travelled divided by the total time taken for a journey. speed = distance travelled /time, instantaneous speed - The speed at one particular moment in a journey., distance/time graph - A graph of the distance travelled against time for a moving object. The gradient of a line on a distance/time graph gives the speed., velocity/time graph - A graph of velocity against time for a moving object. The gradient of the graph gives acceleration and the area under gives the distance travelled., gradient - A way of describing the steepness of a line on a graph. It is calculated by taking the change in y divided by the change in x., acceleration - A measure of how quickly the velocity of something is changing. It can be positive if the object is speeding up or negative if it is slowing down.,

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