# Distance Time Graphs - PowerPoint PPT Presentation

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## Distance Time Graphs

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### Distance Time Graphs Understanding and interpreting Distance Time Graphs Describing a journey made by an object is very boring if you just use words. – PowerPoint PPT presentation

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Title: Distance Time Graphs

1
Distance Time Graphs
• Understanding and interpreting

2
Distance Time Graphs
• Describing a journey made by an object is very
boring if you just use words. As with much of
science, graphs are more revealing.
• Plotting distance against time can tell you a lot
about a journey. Let's look at the axes
• Time always runs horizontally (the x-axis). The
arrow shows the direction of time. The further to
the right, the longer time from the start.
• Distance runs vertically (the y-axis). The higher
up the graph we go, the further we are from the
start.

3
Not moving? This is what it looks like
• If something is not moving, a horizontal line is
drawn on a distance-time graph (dt-graph).
• Time is increasing to the right, but its distance
does not change. It is stationary.

4
Moving.
• If something is moving at a steady speed, it
means we expect the same increase in distance in
a given time
• Time is increasing to the right, and distance is
increasing steadily with time. It moves at a

5
• If something is moving at a steady speed, it
means we expect the same increase in distance in
a given time
• Time is increasing to the right, and distance is
increasing steadily with time. It moves at a

6
Can you describe what is going on here?
• For the first part of the journey shown by the
graph below, the object moved at a steady (slow)
speed.
• It then suddenly increased its speed, covering a
much larger distance in the same time.
• This sort of motion is not very realistic, but is
easy to understand. It also makes calculations
easier!

7
What is the effect of line Steepness, A.K.A
slope
• Both the lines below show that each object moved
the same distance, but the steeper yellow line
got there before the other one
• A steeper gradient indicates a larger distance
moved in a given time. In other words, higher
speed.
• Both lines are of constant gradient, so both
speeds are constant.

8
• The line below is curving upwards. This shows an
increase in speed, since the gradient is getting
steeper
• In other words, in a given time, the distance the
object moves is larger. It is accelerating.

9
• There are three parts to the journey shown below
• Moving at a steady speed, slowly Not moving for
quite some time Moving again, but at higher
speed
• In all the graphs so far, we have not seen any
numbers - it's about time we did!

10
Finding speed from these types of graphs!
• We can see that the motion shown by the yellow
line is fastest.
• By definition, speed distance / time so the
steepness (or gradient) of the line will give us
the speed!
• Yellow speed distance / time 30 m / 10 s 3
m/s
• Blue speed distance / time 20 m / 20 s 1
m/s

11
Calculate the speeds of different sections within
a graph
• Stage 1 speed distance / time 100 m / 10 s
10 m/s
• Stage 2 speed distance / time 50 m / 10 s
5 m/s
• Stage 3 speed distance / time 150 m / 20 s
75 m/s