Distance-Time Graph Notes The gradient (or slope) of a distance-time graph tells us the speed. A steep gradient means a high speed, and zero gradient (a flat bit on the graph) means that the object isn't moving. If the line is straight, it means a constant speed. A curved line means acceleration or deceleration.

By counting squares on the graphs, we can work out distances and times. Remember that speed = distance ÷ time, so by counting squares we can work out the speed for each part of the graph.     Journey 1 Time (seconds) 0 5 10 15 20 25 30 35 40 45 50

Distance (metres) 0 1 2 3 4 4 7 10 13 16 19

     

     

    Journey 2 Time (seconds)

Distance (metres)

0 2 4 6 8 10 12 14 16 18 20

5 10 15 20 25 35 45 55 60 62 63

   

Notes: What does a distance-time graph look like for no speed, or increasing or decreasing speeds? (Acceleration)

          Graph  these  points  on  the  graph   inside.    Mark  what  is  happening   at  each  point  (use  the  notes   above).  Calculate  the  average   speed  for  your  graph,  and  key  it   RED  at  the  end  of  your  graph.     Calculate  the  instantaneous   speed  at  each  point,  and  write  it   in  GREEN  at  each  point.     

                                       

Notes:

What does a distance-time graph look like for no speed, or constant slow or fast speeds?  

Glue  this  side  down   To  your  composition  books  

          Graph  these  points  on  the  graph   inside.    Mark  what  is  happening   at  each  point  (use  the  notes   above).  Calculate  the  average   speed  for  your  graph,  and  key  it   RED  at  the  end  of  your  graph.     Calculate  the  instantaneous   speed  at  each  point,  and  write  it   in  GREEN  at  each  point.   