Movement

• Speed


  A way of saying how fast something is travelling/moving
• Speed


  • Measured in m/s
  • Calculated as distance (m) divided by time (s)
• Instantaneous speed


  Speed of an object at a particular moment
• Average speed


  Total distance travelled divided by the total time taken for a complete journey
• Relative motion


  How fast one thing is travelling compared to another
• No speed


  Object's distance isn't changing as time goes on
• Constant speed


  Object moves the same distance each second
• Motion graphs


  • No speed = horizontal line
  • Constant speed = diagonal line
• Decelerating speed (decreasing)


  Object is changing its speed, it's getting slower and slower
• Average speed


  Total distance / Total time
• Constant speed (backwards)


  Object moves the same distance each second but moving backwards
• Accelerating speed (increasing)


  Object is changing its speed, it is getting faster and faster