Speed

• What does distance tell us?

  How far an object moves, it does not involve direction.
• What quantity is distance?

  Scalar quantity because it has a magnitude but no direction.
• What does displacement tell us?

  The distance that an object moves in a straight line from the start point to the finish point.
• What must displacement include?

  The direction of that straight line
• What quantity is displacement?

  Displacement is a vector quantity as it includes both magnitude and direction.
• What does speed tell us?

  The distance the object travelled in a given time.
• What quantity is speed?

  Scalar quantity because it does not involve direction
• What is the equation for speed?

  Speed (m/s) = Distance (m) / Time (s)
• What is the symbol for speed?

  v (velocity)
• What is the symbol for distance?

  S
• What is the normal walking speed?

  1.5 m/s
• What is the typical running speed?

  3 m/s
• What is the typical cycling speed?

  6 m/s
• The typical speed of cycling walking and running can depend on what several factors?

  Fitness level, terrain, distances travelled.
• What is the typical speed of a car on the main road?

  13 m/s
• What is the typical speed of a fast train in the UK?

  50 m/s
• What is the typical speed of a cruising aeroplane?

  250 m/s
• What is the typical speed of sound in air?

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

  Temperature= speed travels faster on warmer days.
• what is the speed of a moving object like?

  Rarely constant, to make calculations easier we calculate the average speed over the total length of the journey.
• How can we calculate the distance travelled by an object moving at a constant speed?

  Distance (m) = Speed (m/s) x Time (s)