Acceleration is changing an objects velocity over time. By combining speed and velocity, you have your acceleration. If a car was driving at 65 miles per hour and changing direction at the same time, it is accelerating. How? Well, by changing its direction, its changing its velocity. Since acceleration is velocity over time, it changes its overall acceleration, even if tit is going the same exact speed the entire time.
http://www.youtube.com/watch?v=rZo8-ihCA9E (Link explaining speed velocity and acceleration)
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