Science: Physics - Speed, velocity and acceleration

This post is linked to a theoretical project we had a look at using physics formulas for real events.

It brought about the differences between speed, velocity and acceleration.

Here is a website that explains some of the differences between  velocity and acceleration:  http://library.thinkquest.org/28388/Mechanics/Velacc/vecacc.htm

They say that Velocity describes how fast an object is moving. The difference between velocity and speed is that velocity is a vector.

Whilst acceleration describes how the velocity is changing.

Here is another site on acceleration:  http://www.edinformatics.com/math_science/acceleration.htm

They say:  "Speed or Velocity?

Speed is the rate of motion, or the rate of change of position. It is expressed as distance moved (d) per unit of time(t). Speed is a scalar quantity with dimensions distance/time. Speed is measured in the same physical units of measurement as velocity, but does not contain an element of direction."

and they say that

"Acceleration

 is defined as the rate of change of velocity. It is thus a vector quantity with dimension length/time²"

This is a topic we will look into in more depth.  I will put a post of good websites for Science and Physics in a minute - they are good sites to work form and refer to.