Vector and Scalar

• Vector quantities have a magnitude and a direction
• Vector quantities:

  • Force
  • Velocity
  • Displacement
  • Acceleration
  • Momentum
• Scalar quantities - Quantities which only have magnitude
• Scalar quantities:

  • Speed
  • Distance
  • Mass
  • Temperature
  • Time
• Distance

  • How far an object has moved
  • A scalar quantity
• Displacement

  • Vector quantity
  • Measures the distance and direction in a straight line from a start point to finish point
• Speed

  • Measure of how fast you go
  • Scalar quantity
• Velocity

  • How fast you are going
  • Vector quantity
• Speeds

  • Walking speed - 1.5m/s
  • Running speed - 3m/s
  • Cycling speed - 6m/s
  • Car - 25m/s
  • Train - 30m/s
  • Plane - 250m/s
• Speed can be affected by:

  • Fitness
  • Age
  • Distance travelled
  • Terrain
• Wind speed can be affected by:

  • Temperature
  • Atmospheric pressure
  • Structures
• Acceleration is the change in velocity in a certain amount of time
• Deceleration is the negative acceleration
• Constant acceleration is also known as uniform acceleration