Its speed, or direction, or both, change. That's called "acceleration".
Motion is a change in position.
When you push on the side of a toy truck that is rolling along the floor, the motion of the truck will slow. This is due to friction caused by the sideways motion.
Motion is the change in an object's position.
Velocity is a change in an object's motion OR direction of motion.
An object in motion stays in motion because it requires a force to change the motion. No force, no change.
If it is constant change in motion, it is acceleration.
Truth in Motion happened in 2010.
Cities in Motion happened in 2011.
E-Motion happened in 1990.
Logo Motion happened in 2011.
Motion is the change in an object's position.