Distance time graphs.

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Presentation transcript:

Distance time graphs

What is speed?

How to we measure speed? What do we need to measure? What units do we use? Do we always use the same units?

Measuring our speed We need to know the distance We need to know the time it takes to move this distance Speed = distance ÷ time

Distance m Time s Speed = Distance ÷ Time = m/s

Motion graphs

Graphshots

Distance-time graphs on an obstacle course Time (s) Distance (m)

Name Mr Butler Time (s) 20 40 80 120 150 180 190 Distance (m) 10 30 50 60 70

Calculating your speed on a distance-time graph Distance = 20m Time =60s To calculate speed at the fastest point Look for the steepest line Mark the start and end Work out the distance and time Use the speed equation to calculate speed Speed = distance ÷ time

Your graph Mark on the graph where your speed was highest and lowest Explain how you create a motion graph of someone running Explain how you work out the speed of a person