Newton's first law of motion states that:

Newton's first law of motion, often referred to as the law of inertia, asserts that an object at rest will remain at rest and an object in motion will continue moving at a constant velocity in a straight line unless acted upon by an unbalanced external force. This principle highlights the concept of inertia, which is the tendency of objects to maintain their state of motion unless influenced by an external force.

The idea conveyed in the correct response emphasizes that the state of an object—whether it is at rest or moving—is stable until a force disrupts that state. This is foundational to understanding motion and is applicable in various scenarios in the physical world, where the absence of external forces results in no change in an object's state.

In contrast, the alternative options do not effectively capture the essence of this law. For example, stating that an object in motion will stay in motion without exception overlooks the role of forces such as friction or air resistance that can change an object's state of motion. The assertion about mass being the same regardless of gravity misrepresents the relationship between mass and weight in relation to forces acting on an object. The idea that motion is constant in the absence of friction is not entirely accurate; motion can also be influenced by other forces, not just