Presentation on theme: "Distance Time Graphs Time is always plotted on x axis"— Presentation transcript:
1 Distance Time Graphs Time is always plotted on x axis Distance is always plotted on y axisTo figure average speed, divide distance by time
2 Distance-time graphs 2) Horizontal line = Stopped, not moving 40 30 20 104) Diagonal line downwards = returning to startDistance(meters)3) Steeper diagonal line = faster the motionTime/sDiagonal straight line = moving at constant speed
3 Distance – time GraphsLine is curving upwards – shows increase in speedIt is accelerating.Curving downwards – shows decrease in speed,It is still accelerating – change in speed
4 40302010Distance(meters)Time/sWhat 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?
5 How to calculate slope Slope = y2 – y1 X2 - X1 Rise divided by Run 25- 5 = 20Slope = 4 m/s
6 QuestionWhat does the slope of a distance vs. time graph show you about the motion of an object?It tells you the SPEED
7 Leroy is the fastest. He completed the race in 3 hours QuestionBelow is a distance vs. time graph for 3 runners. Who is the fastest?Leroy is the fastest. He completed the race in 3 hours
8 Speed Time Graphs Time in plotted on X-axis Speed or velocity is plotted on Y-axisShows acceleration
9 Speed-time graphs 1) Upwards line = object is accelerating 80 60 40204) Downward line = object is deceleratingVelocitym/s3) Upwards line =2) Horizontal line = speed is constantT/s
10 80604020Velocitym/sT/sHow 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?