According to Newton's first law of motion, also known as the law of inertia, an object will continue to move at a constant velocity in a straight line unless acted on by an unbalanced force. This means that if an object is at rest, it will remain at rest unless acted on by an external force. Similarly, if an object is moving at a constant velocity, it will continue to move at that velocity in a straight line unless acted on by an unbalanced force.
Therefore, in order to change the motion of an object, there must be a change in the forces acting on the object. This can be done by applying an external force to the object, such as pushing or pulling it, or by changing the environment in which the object is moving, such as by placing it in a different gravitational field or by introducing friction.
