# Distance, speed and acceleration

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• Created by: Nadia
• Created on: 20-12-12 16:05
• distance, speed and acceleration
• Speed is a measure of how fast an object/ animal is moving
• speed=distance (m) / time (s)
• speed is a scalar quantity (only has magnitude)
• Velocity is a vector and has direction as well as magnitude
• velocity is measured in metres per second, in a specified direction
• on distance-time graphs stationary objects are shown by flat straight lines
• objects travelling at constant velocity are shown by straight sloping lines
• the speed of an object can be found by measuringthe gradient of the graph
• acceleration is the rate of change of velocity
• objectsgoing faster are accelerating, objectsgoing slower are decelerating
• units of acceleration are m/s^2
• on velocity-time graphs objects travelling at constant velocity are shown by straight lines
• a straight line sloping downwards indicates an object decelerating
• the acceleration can be found by measuringthe gradient of the velocity-time graph
• the area under the graph is the distance travelled