A change in velocity or change in speed/direction

Answer 1

is called acceleration. Acceleration can be positive, meaning the object is speeding up, or negative, meaning the object is slowing down. Acceleration can also change the direction of the object's motion.

In physics, acceleration is a vector quantity, meaning it has both magnitude and direction. It is calculated by dividing the change in velocity by the time it takes for the change to occur.

Acceleration is a crucial concept in understanding the motion of objects, as it helps describe how an object's velocity is changing over time. It is also an important factor in determining the forces acting on an object, according to Newton's second law of motion.