* Acceleration is the rate of change of velocity. This means acceleration tells you how quickly velocity is changing.
* Constant acceleration means the velocity is changing at a steady rate.
Examples:
* A car accelerating at a constant 5 m/s²: The car's velocity will increase by 5 meters per second every second. Even though the acceleration is constant, the velocity is steadily increasing.
* A ball thrown straight up: The ball's velocity decreases as it goes up (due to gravity), reaches zero at the peak, and then increases as it falls back down. The acceleration due to gravity remains constant throughout the entire motion, even though the velocity changes.
Important Note:
* Constant acceleration does *not* mean constant speed. Velocity includes both speed and direction.
* If velocity is increasing, acceleration is in the same direction as the velocity. If velocity is decreasing (slowing down), acceleration is in the opposite direction of velocity.
