* Acceleration is the rate of change of velocity. Velocity includes both speed (how fast you're going) and direction.
* To accelerate means to either increase your speed, decrease your speed, or change your direction.
* If you maintain the same speed, you are not changing your velocity, and therefore, you are not accelerating.
Think of it this way:
* Speeding up is accelerating.
* Slowing down is also accelerating (it's called deceleration).
* Turning is accelerating because you're changing direction, even if your speed stays the same.
So, to summarize:
* You can accelerate by increasing your speed.
* You can accelerate by decreasing your speed.
* You can accelerate by changing your direction.
* You cannot accelerate while maintaining the same speed.
