Final answer:
The second part of Newton's first law states that an object at rest will stay at rest unless acted on by an external force, reflecting the concept of inertia which is tied to the object's mass.
Step-by-step explanation:
The second part of Newton's first law addresses the behavior of objects at rest. It asserts that an object at rest will stay at rest unless an outside force makes it move. This principle is a direct consequence of the concept of inertia, which is dependent on the mass of an object. Therefore, an object will not move simply because it experiences a lot of friction; instead, friction may actually be the force that keeps it at rest until another external force overcomes the friction. Similarly, the statement that objects at rest have more inertia than objects in motion is incorrect; inertia is a property related to mass, not the state of motion.