**In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity.**

**To accelerate an object is to change its velocity, which is accomplished by altering either its speed or direction (like in case of uniform circular motion) in relation to time.**

**In this strict mathematical sense, acceleration can have positive and negative vals (deceleration).**

**Any time that the sign (+ or -) of the acceleration is the same as the sign of the velocity, the object will speed up.**

**If the signs are opposite, the object will slow down.**

**Acceleration is a vector defined by properties of magnitude (size or measurability) and direction.**

**When either velocity or direction are changed, there is acceleration (or deceleration).**

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