Velocity describes how position changes; acceleration describes how velocity changes. Two layers of change!
What does acceleration mean?
Compared … See more

Compared to displacement and velocity, acceleration is like the angry, fire-breathing dragon of motion variables. It can be violent; some people are scared of it; and if it's big, it fo… See more

To be specific, acceleration is defined to be the rate of change of the velocity.
a=ΔvΔt=vf−viΔt‍ 
The above equation says that the acceleratio… See more

I have to warn you that acceleration is one of the first really tricky ideas in physics. The problem isn’t that people lack an intuition about acceleration. Many people do have an intuition … See more

A neurotic tiger shark starts from rest and speeds up uniformly to 12 meters per second in a time of 3 seconds.
What was the magnitude of the average acceleratio… See more