"Motion" What is Definition of Motion and How it's Work ?

Definition of Motion

 

When the earth rotates, all objects on the earth's surface also rotate. Tree and houses which look standing still also rotate. However, they are considered to be unmovable. Why so?  A rider rides on the highway. In this case, the man is considered to be movable. Why so?

Trees and houses are considered to be unmovable because the position is stable, while a driving rider is considered to be movable because the position change. For more details, look at the following case study.

A buss is leaving a bus station. The bus to be considered movable because the position toward the bus always change. In this case, the bus is avoiding the bus station. The passenger is also considered to be movable because the position toward the bus station also changes.

However, the passenger is considered to be unmovable toward another passenger sitting next to him/her. The passenger is considered to be unmovable because both positions do not change.An object is considered to be movable if the position toward a reference point changes.