distance-time graphs

• What can you determine from a distance time graph?

  An object's speed
• What should higher tier students be able to use to determine the speed of an accelerating object?

  A tangent
• What is the key fact about an object moving along a straight line?

  Distance can be represented by a graph
• What do the axes of a distance time graph represent?

  Distance on the y-axis, time on the x-axis
• What does the point at 0 seconds and 0 m represent?

  The person before they started walking
• What do you do to connect the points on the distance time graph?

  Connect the dots with straight lines
• What does the gradient of a distance time graph tell us?

  The object's speed
• How do you calculate the speed from the gradient?

  Divide distance traveled by time taken
• What does an upward sloping curve on a distance time graph indicate?

  The object is accelerating
• How do you determine the speed of an object at a specific point on an accelerating graph?

  Draw a tangent at that point
• How do you calculate the speed at 100 seconds on the accelerating graph?

  Divide distance by time using the tangent