* The object's speed increases. Since acceleration is the rate of change of velocity, and the acceleration is in the same direction as the velocity, the object will move faster in the same direction.
* The object's direction of motion remains unchanged. Because the acceleration is parallel to the velocity, there's no component of the acceleration that would cause the object to change direction.
Example:
Imagine a car driving down a straight road. If the car accelerates in the same direction it's already moving, its speed will increase, but it will continue traveling in a straight line.
Key Points:
* If the acceleration vector is anti-parallel (opposite direction) to the velocity vector, the object's speed will decrease.
* If the acceleration vector is perpendicular to the velocity vector, the object's direction will change, but its speed might remain constant (in case of uniform circular motion).
