5.4.2 Speed

• What is the definition of speed?

  Speed is a scalar quantity that measures how fast an object is moving.
• How is speed defined in terms of distance and time?

  Speed is defined as the rate at which distance is covered.
• What type of quantity is speed?

  Speed is a scalar quantity.
• What does it mean that speed has only magnitude and no direction?

  It means that speed only indicates how fast an object is moving, not the direction of that movement.
• What is the basic formula for speed?

  • Speed = Distance / Time
• In what units is speed commonly measured?

  Speed is measured in meters per second (m/s) or kilometers per hour (km/h).
• How is distance defined in the context of speed?

  Distance is the total length of the path traveled, measured in meters (m) or kilometers (km).
• How is time defined in the context of speed?

  Time is the duration of travel, measured in seconds (s) or hours (h).
• What is the conversion factor from m/s to km/h?

  To convert from m/s to km/h, multiply by 3.6.
• What is the conversion factor from km/h to m/s?

  To convert from km/h to m/s, divide by 3.6.
• How do you calculate speed using an example of a car traveling 100 kilometers in 2 hours?

  • Speed = Distance / Time
  • Speed = 100 km / 2 h = 50 km/h
• How do you calculate speed for a runner covering 400 meters in 50 seconds?

  • Speed = Distance / Time
  • Speed = 400 m / 50 s = 8 m/s
• How does speed differ from velocity?

  Speed is a scalar quantity that measures how fast something is moving, while velocity is a vector quantity that includes both speed and direction.
• What is the formula for velocity?

  Velocity is described as Velocity = Displacement / Time.
• How is average speed calculated?

  • Average Speed = Total Distance / Total Time
• How do you calculate average speed for traveling 30 kilometers at 60 km/h and another 30 kilometers at 40 km/h?

  • Average Speed = Total Distance / Total Time
  • Average Speed = 60 km / (30 km / 60 km/h + 30 km / 40 km/h) = 24 km/h
• What does a speed-time graph represent?

  • Plots speed against time
  • Slope represents acceleration
  • Area under the graph represents distance traveled
• What are the key points about speed?

  • Speed is a scalar quantity
  • Measures how fast an object is moving
  • Calculated as Speed = Distance / Time
  • Units: m/s or km/h
• What is average speed useful for?

  • Calculating speed over varying conditions