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Hi everyone,

Welcome to Online Revision

The title is lame, but well... If you can, you can suggest a nicer name for me :D

Anyway, this blog site is dedicated to consolidating some notes that we have (along with some other contributors' notes) for O levels and A levels. The objective is to achieve a light-hearted, yet informative resource site in which students can revise. Studying and learning should not be made a chore, but instead, something fun. Hopefully, we can achieve that.

Stay tune as the site is being done up. Cheers!

Latest update:
All notes will be created at instead. Thanks.



  • Speed, velocity and acceleration
  • Graphical analysis of motion
  • Free-fall
  • Effect of air resistance

  • Speed is the distance moved per unit time.
  • The SI unit of speed is metres per second (m/s)
  • Speed = Distance / Time
  • Speed = Gradient of distance-time graph
  • Speed is a scalar quantity; it has only magnitude, no direction

  • Velocity is the distance moved in a given direction per unit time, or displacement per unit time.
  • The SI unit of velocity is metres per second (m/s)
  • Velocity = Distance moved in a given direction / Time or Speed = displacement / time
  • Velocity = Gradient of displacement-time graph
  • Velocity is a vector quantity; it has both magnitude and direction

  • Acceleration is the change in velocity per unit time.
  • Acceleration = Change in velocity / Time
  • Acceleration = (Final velocity - Initial velocity) / Time
  • Acceleration = Gradient of velocity-time graph
  • Acceleration is a vector quantity; it has both magnitude and direction
  • The SI unit of acceleration is metres per second square (m/s²)

Distance-Time Graph
  • Speed, v = Gradient of the distance-time graph

  • Gradient = y / x = speed

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