Speed and velocity

• Scalar quantities?

  Speed, distance, mass, time
• Scalar quantities?

  Speed, distance, mass, time
• Vector quantities?

  Velocity, displacement, force, acceleration
• Vector quantities?

  Velocity, displacement, force, acceleration
• Distance travelled (m) = speed (m/s) x time (s)
• Displacement (m) = velocity (m/s) x time (s)
• What does D stand for?

  Distance

  
• What does S stand for?

  Speed

  
• What does T stand for?

  Time

  
• Distance measures how far something has travelled.
• Displacement measures how far something has travelled and what direction it has travelled in.
• To measure the speed of an object, you only need to measure how fast it is going, the direction is not important.
• Velocity is more useful to measure motion, because it describes both speed and direction.