year 9 acceleration- big test prep

• To work out an object’s speed you need to know the distance it has travelled and the time time taken.

  Calculate speed using the equation .

  speed= distance/time
• objects moving in the same direction

  relative speed= fastest speed - slowest speed
• Objects moving in opposite directions towards, or away from, each other

  relative speed= speed 1 + speed 2
• in a distance time graph…

  Time in seconds is on the x-axis. Distance in metres is on the y-axis.
• The gradient of the line on a distance-time graph is equal to the speed.

  Calculate the gradient of the line using the following equation:

  gradient = change in y value/ change in x value
• What does a straight diagonal line on a distance-time graph indicate about an object's motion?


  The object is travelling at a constant speed.
• What does the gradient of a line on a distance-time graph represent?


  The gradient represents the speed of the object.
• How is acceleration represented on a distance-time graph?


  It is shown with a curved line that gets steeper.
• What does point c on a distance-time graph indicate about the object's speed?


  The object is travelling at a constant speed, which is faster than before.
• What does a steeper straight line on a distance-time graph indicate?


  It indicates a larger gradient, meaning a faster speed.
• How is deceleration represented on a distance-time graph?


  It is shown with a curved line that gets less steep.
• What does point e on a distance-time graph indicate about the object's motion?


  The object is stationary.
• What does a flat line on a distance-time graph signify?


  It signifies that the distance does not change as time increases.
• What is the gradient of the line for a stationary object on a distance-time graph?


  The gradient is zero, indicating that the speed is zero.