acceleration

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

  Acceleration
• What is the definition of velocity?

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

  Because it has both magnitude and direction
• What does acceleration tell us about an object's motion?

  It tells us the change in velocity over a given time
• How is acceleration calculated?

  Acceleration = change in velocity / time
• What is the unit of acceleration?

  m/s²
• If a car's velocity changes from 15 m/s North to 35 m/s North in 20 seconds, what is its acceleration?

  1 m/s²
• What is the change in velocity if a cyclist's velocity reduces from 6 m/s East to 0 in 12 seconds?


  • 6 m/s
• What is the acceleration of the cyclist if her velocity reduces to 0 in 12 seconds?

  • 0.5 m/s²
• What does a horizontal line on a velocity-time graph indicate?

  The object is traveling at a constant velocity
• What does an upward sloping line on a velocity-time graph indicate?

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

  0.15 m/s²
• If the final velocity is 0 and the initial velocity is 50 m/s over 300 seconds, what is the acceleration?

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

  • The distance traveled in a specific direction
  • Also known as displacement
• How do you calculate the total area under a velocity-time graph with constant acceleration or deceleration?

  1. Divide the graph into shapes (triangles, rectangles)
  2. Calculate the area of each shape
  3. Add the areas together
• If a triangle on a velocity-time graph 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 when acceleration and deceleration are not constant?

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

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

  • In the vision workbook
  • Available through a link provided in the video
• What should you be able to calculate by the end of the video?

  The velocity of an object accelerating at a constant rate
• How is acceleration calculated?

  Acceleration equals a change in velocity divided by the time
• Is the acceleration equation provided in the exam?

  Yes, you are given this equation in the exam
• What does the equation for constant acceleration relate to?

  The final velocity squared minus the initial velocity squared equals two multiplied by the acceleration multiplied by the distance
• Why might the acceleration equation appear more frequently on higher papers than foundation papers?

  It is considered trickier and more complex
• What is the sample question regarding a car's velocity and acceleration?

  • A car is driving at 8 m/s
  • It accelerates by 2 m/s² to a final velocity of 12 m/s
  • Calculate the distance traveled
• What is the distance traveled by the car in the sample question?

  20 meters
• What is the question for the cyclist's acceleration problem?

  • A cyclist is moving at 3 m/s
  • Accelerates to 5 m/s over a distance of 50 meters
  • Calculate the acceleration of the cyclist
• What is the acceleration of the cyclist in the problem?

  0.16 m/s²
• What is the final question regarding a train's velocity and acceleration?

  • A train has an initial velocity of 20 m/s
  • It accelerates at 5 m/s² over a distance of 50 meters
  • Calculate the final velocity
• What is the final velocity of the train in the problem?

  30 m/s
• What is the acceleration of an object falling towards the Earth?

  Approximately 9.8 m/s²
• What force acts on a skydiver as they fall?

  The force of gravity
• What is air resistance in the context of a skydiver falling?

  An upward force of friction with the air particles
• What happens when the force of air resistance balances the force due to gravity?

  The object stops accelerating and moves at a constant velocity
• What is the term for the constant velocity reached by a falling object?

  Terminal velocity
• Does terminal velocity apply to all objects falling through a fluid?

  Yes, it applies to any object falling through a fluid
• What factors affect the terminal velocity of an object?

  The shape of the object affects the force of friction and terminal velocity
• Where can you find more questions on acceleration?

  In the revision world book