speed/velocity and distance/displacement

• What are the two types of quantities?

  Scalar and vector
• What is a scalar quantity?


  A quantity that only has magnitude
• Why is speed considered a scalar quantity?


  Because it only conveys magnitude
• Give an example of speed.


  A person running at four meters per second
• What is velocity?


  A vector quantity that has both magnitude and direction
• Provide an example of velocity.


  A person cycling six meters per second east
• What is the difference between speed and velocity?


  Speed is scalar, while velocity is a vector
• What type of quantity is distance?


  Scalar
• What is displacement?


  A vector quantity that has both magnitude and direction
• Give an example of displacement.


  A person running 40 meters east
• How do you calculate the speed of an object?

  • Speed = Distance / Time
  • Example: For a train crossing a 550-meter bridge in 10 seconds:
  • Speed = $\frac{550 \text{ meters}}{10 \text{ seconds}} =$$55 \text{ meters per second}$
• How do you calculate the velocity of an object?

  • Velocity = Displacement / Time
  • Example: If the train travels 550 meters east in 10 seconds:
  • Velocity = $\frac{550 \text{ meters east}}{10 \text{ seconds}} =$$55 \text{ meters per second east}$
• What does the letter 's' represent in the velocity equation?


  Displacement
• What does the letter 'd' represent in the speed equation?


  Distance
• What does the letter 't' represent in both equations?

  Time
• Why do people often use the velocity equation without a direction?


  Because it allows for negative velocity to represent going backwards
• What is average speed or average velocity?


  • Average Speed = Total Distance / Total Time
  • Average Velocity = Total Displacement / Total Time
• What is the average walking speed of a person in meters per second?


  About 1.5 meters per second
• What is the average running speed of a person in meters per second?


  Around 3 meters per second
• What is the average cycling speed of a person in meters per second?


  About 6 meters per second
• What is the average speed of a car on the main road in meters per second?


  Around 25 meters per second
• What is the average speed of a fast train in meters per second?


  About 55 meters per second
• What is the speed of sound waves in air in meters per second?


  330 meters per second
• How does the speed of sound change in different mediums?


  It varies depending on the medium
• What factors can affect the speed of wind?


  Temperature, atmospheric pressure, and structures like buildings
• What can the speed of wind vary from on a still day?


  Almost zero meters per second
• What can the speed of wind exceed on a windy day?


  Faster than a speeding train