speed

• What is speed?

  
  

  What quantity is it?


  How fast you're going

  
  

  Scalar - no direction
• Why does an object moving in a circle have a changing velocity but constant speed?

  Same speed

  
  

  Changing direction
• Equation for distance travelled

  Distance travelled (m) = speed (m/s) x time (s)
• TYPICAL EVERYDAY SPEEDS

  
  

  Person walking

  Person running

  Person cycling

  
  

  Car

  Train

  Plane

  1.5 m/s

  3 m/s

  6 m/s

  
  

  25 m/s

  30 m/s

  260 m/s
• What affects the speed something travels at?

  Fitness

  
  

  age

  
  

  distance travelled

  
  

  terrain
• What is the speed of sound in air?

  
  

  Why does this change?

  330 m/s

  
  

  Speed of wind, what the sound waves are travelling through
• What can windspeed be affected by?

  Temperature

  
  

  atmospheric pressure

  
  

  large buildings/ structures