speed

• What is distance in physics?

  How far an object moves
• Why is distance considered a scalar quantity?

  It does not have direction
• What is displacement in physics?

  A vector including distance and direction
• How does displacement differ from distance?

  Displacement includes direction, distance does not
• What is the walking speed of a human?

  1.5 m/s
• What is the running speed of a human?

  3 m/s
• What is the cycling speed of a human?

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

  330 m/s
• What is velocity in physics?

  Speed in a given direction
• Why is velocity considered a vector quantity?

  It has both magnitude and direction
• How does an object's velocity change?

  If its direction changes, even at constant speed
• What happens to an object's velocity when it moves in a circle?

  Its velocity is always changing
• What is acceleration in physics?

  Change in velocity per second
• Why is acceleration considered a vector quantity?

  It has both magnitude and direction
• What is positive acceleration?

  Speed or direction increases
• What is negative acceleration?

  Speed or direction decreases
• What happens when an object moves through a fluid?

  A frictional drag force acts on it
• How do drag forces behave?

  They act opposite to the object's movement
• How do drag forces change with speed?

  They increase with the object's speed
• What factors affect drag forces?

  Shape and size of the object
• What is air resistance?

  The frictional drag force in air
• How does streamlining affect drag?

  It reduces the drag experienced
• What forces act on an object falling through a fluid?

  Weight due to gravity and drag force
• What happens to the weight of an object as it falls?

  It remains constant
• How does the drag force change as an object speeds up?

  It gets bigger as it speeds up
• What happens to the resultant force as drag increases?

  It gets smaller as drag increases
• What happens to acceleration as an object falls?

  It decreases as it falls
• What is terminal velocity?

  The constant velocity reached when forces balance
• What occurs at terminal velocity?

  The drag force equals the object's weight