Movement and Position

    Cards (14)

    • What is the equation for average speed?
      Average speed = distance travelled / time taken
    • Define velocity
      • Speed in a given direction
      • A vector quantity
    • How do you find the velocity on a distance-time graph?
      Calculate the gradient
    • How do you read a distance time graph?
      1. Straight line = moving at constant speed away from starting point
      2. Steeper straight line = moving at faster constant speed away from starting point
      3. Downwards curving line = decelerating
      4. Horizontal line = stationary
      5. Upward curving line = accelerating
      6. Straight line towards x axis = constant speed back towards starting point
      7. Y axis represents Distance (m)
      8. X axis represents Time (s)
    • How is the gradient of a straight line calculated?
      • Change in y-axis
      • Change in x-axis
    • Describe how to investigate the average speed of an object
      • Measure distance travelled - e.g. with a ruler
      • Use a suitable, sensible distance
      • Measure time taken - e.g. with a stopwatch
      • Start and stop timing at a set point
      • Repeat experiment and calculate mean time
      • Speed = distance / time
    • How could the accuracy of this be improved?
      Investigate the average speed of an object.
      Could be improved with
      • A more accurate timing method
      • e.g. using light gates
    • What is the equation for acceleration?
      Acceleration = change in velocity / time taken
      a = (v - u) / t

      - a = acceleration
      - v = final velocity
      - u = initial velocity
      - t = time
    • How do you read a Velocity-time graph?
      A) velocity (m/s)
      B) 1. Accelerating
      C) 2. Accelerating at faster rate
      D) 3. Travelling at constant velocity (no acceleration)
      E) 4. Decelerating
      F) Area under graph = distance traveled
      G) Time (s)
    • Describe the motion of the object shown by the velocity - time graph above
      • From 0-10s, object accelerates slowly
      • From 10-20s, object accelerates faster
      • From 20-40s, object travels at constant velocity (Note: It does not stop)
      • From 40-50s, object decelerates until it stops
    • How do you find acceleration on a velocity-time graph?
      Calculate gradient
    • How do you find the distance travelled in a velocity-time graph?
      Calculate area under the graph
    • What is the relationship between
      final speed (v), initial speed (u), acceleration (a) and distance (s)
      = + 2as
    • What is the SUVAT equation?
      Equation of motion.
      Use v²  =   + 2as