Change in place or position of an object or body is called :

Question

Accepted Answer

The correct option is (2):
Motion is the fundamental and most direct term used in physics to describe a "change in place or position of an object or body" with respect to a fixed reference point over a period of time. It is the core concept of kinematics, a branch of classical mechanics that is solely concerned with describing the movement of objects. Whether the change is translational, rotational, or oscillatory, any displacement of an object from its initial coordinates to a final set of coordinates is fundamentally classified as motion. This definition precisely matches the phenomenon described in the question, making it the unequivocally correct answer.

The incorrect option is (1):
Force is defined as a push or a pull that acts on an object. Crucially, force is the *cause* or *agency* that changes or tends to change an object's state of motion, but it is not the change itself. According to Newton's Second Law, the net force causes acceleration, which is the rate of change of velocity, and thus a change in position. In simple terms, a force makes motion happen or changes existing motion, but the event of changing position is termed motion.

The incorrect option is (3):
Friction is a specific type of contact force that acts between two surfaces to oppose relative motion or attempted motion. It is a resistive force, working against the direction of movement, which means it attempts to prevent or slow down a change in position. Therefore, friction is an influence *on* motion, a factor that *affects* the motion, but it does not serve as the definition for the simple act of "change in place or position."

The incorrect option is (4):
Momentum is a vector quantity that is a measure of the mass contained in an object that is in motion. It is calculated by multiplying an object's mass by its velocity ($p = m \times v$). While it is closely related to motion, as an object must be moving to have momentum, it is a description of the *quantity* of motion an object has, not the general, descriptive term for the change in its position.