# Distance Time Graphs Time is always plotted on x axis

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Distance Time Graphs Time is always plotted on x axis
Distance is always plotted on y axis To figure average speed, divide distance by time

Distance-time graphs 2) Horizontal line = Stopped, not moving 40 30 20
10 4) Diagonal line downwards = returning to start Distance (meters) 3) Steeper diagonal line = faster the motion Time/s Diagonal straight line = moving at constant speed

Distance – time Graphs Line is curving upwards – shows increase in speed It is accelerating. Curving downwards – shows decrease in speed, It is still accelerating – change in speed

40 30 20 10 Distance (meters) Time/s What is the speed during the first 20 seconds? What is happening between 20 and 40 seconds? How far is the object from the start after 60 seconds? What is the speed during the last 40 seconds? When was the object travelling the fastest?

How to calculate slope Slope = y2 – y1 X2 - X1 Rise divided by Run
25- 5 = 20 Slope = 4 m/s

Question What does the slope of a distance vs. time graph show you about the motion of an object? It tells you the SPEED

Leroy is the fastest. He completed the race in 3 hours
Question Below is a distance vs. time graph for 3 runners. Who is the fastest? Leroy is the fastest. He completed the race in 3 hours

Speed Time Graphs Time in plotted on X-axis
Speed or velocity is plotted on Y-axis Shows acceleration

Speed-time graphs 1) Upwards line = object is accelerating 80 60
40 20 4) Downward line = object is decelerating Velocity m/s 3) Upwards line = 2) Horizontal line = speed is constant T/s

80 60 40 20 Velocity m/s T/s How fast was the object going after 10 seconds? What is the acceleration from 20 to 30 seconds? What was the deceleration from 30 to 50s? How far did the object travel all together?

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