Final answer:
A parked car at rest requires a net external force to move, which overcomes its inertia according to Newton's first law of motion, also known as the law of inertia.
Step-by-step explanation:
Inertia is a property that keeps a parked car at rest. For the car to move, it must be acted upon by a net external force. According to Newton's first law of motion, also known as the law of inertia, a body at rest will remain at rest unless acted on by a net external force. This net force could be a push or pull resulting in the acceleration of the car from rest to motion.
While the car is parked, all forces acting on it are balanced, resulting in no net force and therefore no movement. To initiate motion, an unbalanced force must be applied to overcome the car's inertia. In the case of a vehicle, this is typically provided by the engine generating a force through the wheels that exceeds the static friction and any other resistive forces.