8 | Summary

Summary

  • A scalar quantity has a magnitude but no direction.
  • Examples of scalar quantities include distance, speed, time, power and energy.
  • A vector quantity has a magnitude and a direction.
  • Examples of vector quantities include displacement, velocity, acceleration, force and momentum.
  • Distance is a measurement of the actual path travelled by an object.
  • Displacement is a measurement of how far away an object is from its original position.
  • Speed is a measure of how fast something moves.
  • It is measured in units such as metres per second (m/s) and kilometres per hour (km/hr).
  • Average speed is an overall measurement of speed between two points in time.
  • Instantaneous speed is a measure of speed at a particular point in time.
  • Average speed can be calculated using the formula:
  • calculating average speed formula summary
  • Speed can be converted from m/s to km/hr by multiplying by 3.6.
  • Speed can be converted from km/hr to m/s by dividing by 3.6.
  • Distance travelled can be calculated using the formula:
  • calculating distance travelled formula summary
  • Time taken can be calculated using the formula:
  • calculating time taken speed formula summary
  • Velocity is a measure of the rate at which displacement changes.
  • It can be calculated using the formula:
  • velocity formula summary

 
skiing and chairlift

(Image: PhotoMIX-Company, Pixabay)