speed

• scalar or vector

  scalar
• speed is rarely constant why?

  people are constantly travelling in different ways
• typical value for walking

  1.5m/s
• typical value for running

  3 m/s
• typical value for cycling

  6 m/s
• speed of person dependant on

  age

  terrain

  fitness
• distance travelled equation

  speed x time
• displacement

  distance object moves in straight line
• speed of car

  13 m/s
• fast train in uk speed

  50 m/s
• aeroplane speed

  250 m/s
• speed of sound

  330 m/s