Inertia is a term used in physics to describe the tendency of an object to remain at rest or in uniform motion in a straight line unless acted upon by an external force. It is closely related to the concept of disinclination to move, which refers to the reluctance of an object to change its state of motion. In other words, it is the resistance to change in velocity. This can be seen in everyday life, such as when a person is reluctant to start a new project or take on a new task. Disinclination to move is a form of INERTIA that can be both physical and mental.