Distance displacement speed and velocity

• What is the difference between distance and displacement?

  Distance is scalar; displacement is vector
• What does distance measure?

  How far an object has moved
• Is distance a vector or a scalar quantity?

  Scalar quantity
• How does displacement differ from distance?

  Displacement includes direction in a straight line
• What is an example of displacement?

  The plane flew 5 metres north
• What is a bearing in terms of displacement?

  A three-digit angle from north
• If you walk 5m north and then 5m south, what is your displacement?

  0m
• What is the distance travelled in the previous walking example?

  10m
• What do speed and velocity measure?

  How fast you’re going
• Is speed a vector or a scalar quantity?

  Scalar quantity
• How is velocity defined?

  Speed in a given direction
• Can an object have constant speed and changing velocity?

  Yes, if it changes direction
• What happens to velocity when an object moves in a circle at constant speed?

  Velocity is constantly changing
• How can you measure the speed of an object moving at constant speed?

  Time how long it takes to travel a distance
• What is the formula to calculate speed?

  $s =$$\frac{d}{t}$
• What does the formula $s =$$\frac{d}{t}$ represent?


  Distance travelled equals speed times time
• What does average speed represent?

  The mean speed during a time period
• What are typical speeds for everyday objects?

  • Walking: 1.5 m/s
  • Running: 8 m/s
  • Cycling: 6 m/s
  • Car: 25 m/s
  • Train: 55 m/s
  • Plane: 250 m/s
• What factors can affect a person's speed while walking or running?

  Mass, age, distance, terrain
• What is the speed of sound in air?

  330 m/s
• What factors can affect the speed of sound?

  Medium sound travels through
• What can affect wind speed?

  Temperature, pressure, nearby structures
• How do large buildings affect wind speed?

  They can reduce the speed of air
• What is the relationship between speed, distance, and time?

  • Speed equals distance divided by time
  • Distance equals speed times time
  • Time equals distance divided by speed