Speed velocity distance and displacement

• What are the two types of quantities mentioned in the video?

  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 distinguishes velocity from speed?

  Velocity has both magnitude and direction
• Provide an example of velocity.

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

  Distance is a scalar, while displacement is a vector
• Give an example of distance.

  10 meters
• Provide 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?

  To represent negative velocity for backward motion
• 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 wind speed vary from on a still day?

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

  Faster than a speeding train
• What is the natural movement of air called?

  Wind
• What is the significance of understanding speed and velocity in physics?

  It helps differentiate between scalar and vector quantities
• How can speed and velocity be confused in exams?

  Both terms are often used interchangeably despite their differences
• Why is it important to know the difference between distance and displacement?

  To accurately describe motion in terms of magnitude and direction