Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Motion L1

3,356 views

Published on

Mechanics

Published in: Education
  • Be the first to comment

  • Be the first to like this

Motion L1

  1. 1. Motion By Nico Vaunois 2011
  2. 2. Distance and Displacement  Distance is the measure of the total length of the path taken during the change of position of an object  Distance is a scalar quantity  Displacement is the measure of the change of position of an object  Displacement is a vector quantity
  3. 3. Speed and Velocity  Speed is the measure of rate of the distance covered  Speed is a scalar quantity Distance covered Speed (m/s) = (m) Time taken (s)  Velocity is the measure of rate of displacement of an object  Velocity is a vector quantity Displacement Velocity Time taken =
  4. 4. Scalars and Vectors  Scalars are quantities that have a size (or magnitude) only  Vectors are quantities that have a size and a direction
  5. 5. d Speed Distance Time s t  We can calculate the speed of a moving object using the equation : Average Speed = Distance covered Time taken s = d t  Because distance is measured in metres (m) and time in seconds (s), the S.I. unit for speed is metres per second (m/s or m s-1) Distance covered Speed (m/s) = (m) Time taken (s)
  6. 6. Acceleration Δv a Δt  Acceleration is the rate of change of speed Acceleration = Change in Velocity Change in Time Δv a = Δt  Because speed is measured in metres per second (m s1) and time in seconds (s), the S.I. unit for acceleration is :  metres per second squared (m/s/s or m s-2) Change in velocity (m Acceleration (m s-2) s-1) Change in time = (s)
  7. 7. Distance – Time graph Speed – Time graph Distance (m) Distance (m) Time (s) Time (s) Speed (m/s) Speed (m/s) Time (s) Distance (m) Distance (m) Speed (m/s) Time (s) Time (s) Time (s) Speed (m/s) Time (s) Time (s)
  8. 8. Distance – Time graph Distance (m) Time (s)  On a distance time graph, the slope or gradient of the line represents the speed of the object at the time  Steeper slope  Greater gradient  Greater speed  No slope  gradient = 0  No speed  No movement  Curved line  change in gradient  change in speed
  9. 9. Speed – Time graph Speed (m/s) Time (s)  On a speed time graph, the slope or gradient of the line represents the acceleration of the object at the time  No slope  gradient = 0  No acceleration Constant speed  Steeper slope  Greater gradient  Greater acceleration  On a speed time graph, the area under the graph represents the distance covered
  10. 10. Velocity - time graphs • Distance and displacement can be found from a velocity - time graph by velocity + Area 1   Area 1 + Area 2 = Distance Area 1 – Area 2 = Displacement Area 2 time
  11. 11. Distance – Time graph Speed – Time graph Distance (m) Time (s) Speed (m/s) Time (s)
  12. 12. d Speed Distance Time s t  We can calculate the speed of a moving object using the equation : Average Speed = Distance covered Time taken s = d t  Because distance is measured in meters (m) and time in seconds (s), the S.I. unit for speed is meters per second (m/s or m s-1) Distance covered Speed (m/s) = (m) Time taken (s)
  13. 13. Δv Acceleration a Δt  Acceleration is the rate of change of speed Acceleration = Change in Speed Change in Time Δv a = Δt  Because speed is measured in meters per second (m s1) and time in seconds (s), the S.I. unit for acceleration is :  meters per second squared (m s-1 /s or m s-2) Change in speed (m Acceleration (m s-2) s-1) Change in time = (s)

×