Which force acts an an object to move it from rest or a constant, straight-line motion?

Balanced forces/Resultant force/ Newton's first law/law of inertia.

It says that each article will remain in its state of rest or similar motion in a straight line except a resultant force works on it. It is known as the law of inertia.

The inertia of the body is the hesitation of the target to alter its state of peace or movement.

The inertia of an article depends on its size. The greater the body, the greater the inertia. It shows it is difficult to start moving, stop, slow down, speed up or change direction. Force is required to overcome inertia.