2.1 Describing Motion

• Velocity is a scalar quantity.

  False
• Match the scalar quantity with its definition:

  Distance ↔️ Total length traveled by an object

  Speed ↔️ Rate at which an object covers distance

  Time ↔️ Duration of an event
• Speed is a vector quantity.

  False
• Vector quantities require direction to be fully described.


  True
• Speed and velocity are always the same.

  False
• Motion refers to the act of changing position
• Is speed a scalar or vector quantity?

  Scalar
• What are the units of speed?

  m/s
• What is the key difference between vector and scalar quantities?

  Vector quantities have direction
• What are the units of average speed?

  m/s
• Average velocity is calculated by dividing the total displacement by the total time taken.
• In a displacement-time graph, a straight line indicates constant velocity.
• To calculate speed from a distance-time graph, find the slope of the graph.
• The formula to calculate speed from a distance-time graph is Displacement divided by time.
• Speed is a scalar quantity because it has no direction.


  True
• Scalar quantities are contrasted with vector quantities, which have both magnitude and direction.
• The formula to calculate average speed is total distance divided by total time.
• Average velocity is measured in meters per second (m/s) and must include a direction.
• What is the slope of a displacement-time graph when an object moves at a constant velocity of 4 m/s?

  4 m/s
• A displacement-time graph that shows an object moving 20 m in 5 seconds would be a straight line with a slope of 4 m/s.

  True
• The formula to calculate speed from a distance-time graph is: Speed = Displacement / Time.
• What is the velocity of an object that moves 50 meters in 10 seconds according to a displacement-time graph?

  5 m/s
• Speed has direction, but velocity does not.

  False
• What is motion defined as?

  Changing position over time
• What does velocity specify that speed does not?

  Direction
• What unit is used to measure velocity?

  m/s
• What are two examples of scalar quantities?

  Distance and time
• Match the vector quantity with its definition:

  Displacement ↔️ Change in position of an object

  Velocity ↔️ Rate of change of position in a specific direction
• Speed and velocity are both measured in m/s but only velocity specifies direction

  True
• Scalar quantities have only a magnitude
• Match the scalar quantity with its definition and units:

  Distance ↔️ Total length traveled by an object (m)

  Speed ↔️ Rate at which an object covers distance (m/s)

  Time ↔️ Duration of an event (s)
• Displacement is a vector quantity measured in meters with a specified direction

  True
• A cyclist traveling 100 meters in 10 seconds has an average speed of 10 m/s

  True
• What must be included when stating average velocity?

  Direction
• What does the slope of a displacement-time graph represent?

  Velocity
• A curved line on a distance-time graph indicates that the object is accelerating or decelerating


  True
• What does the slope of a distance-time graph represent?

  Velocity
• Match the quantity with its characteristic:

  Speed ↔️ Rate of change of position

  Velocity ↔️ Rate of change of position in a specific direction
• Scalar quantities require direction to be fully described.

  False
• Average speed is measured in meters per second (m/s).


  True