* Displacement is the change in an object's position. It is a vector quantity, which means that it has both magnitude and direction. The magnitude of an object's displacement is the distance between its initial and final positions, and the direction is the angle between the initial and final positions.
* Velocity is the rate of change of an object's displacement. It is a vector quantity that has both magnitude and direction. The magnitude of an object's velocity is the distance it travels per unit of time, and the direction is the direction in which the object is traveling.
* Acceleration is the rate of change of an object's velocity. It is a vector quantity that has both magnitude and direction. The magnitude of an object's acceleration is the change in its velocity per unit of time, and the direction is the direction in which the object is accelerating.
An object can be in motion even if it is not moving relative to its surroundings. For example, a person sitting on a train that is moving at a constant speed is in motion relative to the ground, but not relative to the train.
