1. Speed is the rate of change in distance. It is a measure of how fast the distance change in a movement.
  2. Speed is a scalar quantity.
  3. The SI unit of speed is m/s (metre per second)

Equation of Speed

  1. Velocity is define as the rate of displacement change. It is the measure of how fast the displacement change of a moving object.
  2. Velocity is a vector quantity.
  3. The unit of displacemnet is m/s (metre per second)

Equation of velocity

Youtube Video 1

Positive or Negative Sign of Velocity
  1. In velocity, the positive/negative sign indicates direction.
  2. You can take any direction as positive and the opposite as negative.
  3. For a linear motion, normally we take the motion to the right as positive and hence the motion to the left as negative.

Youtube Video 2


  1. Unknown // February 8, 2013 at 8:26 AM  

    thanks a lot.. <3

  2. Unknown // February 8, 2013 at 8:29 AM  

    unit displacement bukan ke m..?

  3. Unknown // November 18, 2014 at 2:22 AM  

    how to download all of this?

  4. Unknown // November 19, 2014 at 12:59 AM  

    Thanks for sharing your thoughts. I truly appreciate your efforts and I am waiting for your next write ups thanks once again.