# Physics Unit 2a (P2): Velocity and Distance Time Graphs

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• Physics: Velocity and Distance-Time Graphs
• Speed & Velocity
• Speed and Velocity are both measured in m/s (or km/h or mph).
• They both simply say how fast you're going.
• Differences
• Speed is just how fast you're going (e.g. 20 m/s) - the direction doesn't matter.
• Velocity is the speed in a given direction, e.g. 20 m/s north.
• Distance-Time Graphs
• 1) A distance-time graph shows the distance travelled by an object over time.
• 2) The slope of a distance-time graph is called the gradient.
• 3) The gradient of a distance-time graph tells you how fast your object is travelling.
• 4) Flat sections are where the object is stationary-it's stopped.
• 5) Straight uphill (/) or downhill (\) sections mean it is travelling at a steady speed.
• 6) The steeper the graph, the faster it's going.
• 7) Downhill sections mean it's going back towards its starting point.
• 8) Curves show a change in speed.
• 9) A steepening curve means it's speeding up (increasing gradient). This is called acceleration.
• 10) A levelling off curve means it's slowing down (decreasing gradient). This is called deceleration.