Acceleration

• What should you be able to describe by the end of the video?

  Acceleration
• What is the definition of velocity?

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

  It has both magnitude and direction
• What does acceleration tell us about an object's velocity?

  It indicates the change in velocity over time
• How is acceleration calculated?

  Change in velocity divided by time
• What is the unit of acceleration?

  m/s²
• What is the change in velocity if a car accelerates from 15 m/s to 35 m/s?

  20 m/s
• If a car accelerates from 15 m/s to 35 m/s in 20 seconds, what is its acceleration?

  1 m/s²
• What does an acceleration of 1 m/s² mean for the car?

  The car increases velocity by 1 m/s each second
• What happens to a cyclist's velocity when it reduces from 6 m/s to 0 m/s?

  It decelerates
• What is the acceleration of a cyclist who slows from 6 m/s to 0 m/s in 12 seconds?

  -0.5 m/s²
• What does a negative acceleration indicate?

  The object is decelerating
• What does the gradient of a velocity-time graph represent?

  Acceleration of the object
• What does a horizontal line on a velocity-time graph indicate?

  Constant velocity
• What does an upward sloping line on a velocity-time graph show?

  The object is accelerating
• What does a downward sloping line on a velocity-time graph indicate?

  The object is decelerating
• How do you calculate acceleration from a velocity-time graph?

  Subtract initial velocity from final velocity
• If the final velocity is 15 m/s and the initial velocity is 0 m/s over 100 seconds, what is the acceleration?

  0.15 m/s²
• What is the acceleration if the final velocity is 0 m/s and the initial velocity is 50 m/s over 300 seconds?

  -0.5 m/s²
• What does the area under a velocity-time graph represent?

  Distance traveled in a specific direction
• How do you calculate the total area under a velocity-time graph with constant acceleration or deceleration?

  • Divide the graph into shapes
  • Calculate the area of each shape
  • Sum the areas to find total distance
• If a triangle has an area of 750, a rectangle has an area of 1500, and another triangle has an area of 2250, what is the total distance traveled?

  4500 m
• How do you estimate the total area under a velocity-time graph with non-constant acceleration or deceleration?

  • Count complete squares
  • Estimate parts of squares
  • Multiply total squares by area of one square
• If there are 15 complete squares and approximately 5 partial squares under a graph, and each square has an area of 250, what is the total distance?

  5000 m
• Where can you find more questions on acceleration and velocity-time graphs?

  • Vision workbook
  • Click the link provided in the video