Final answer:
The inaccurate statement about gravity is that only very large objects exert a gravitational force. All objects with mass exert gravitational forces, as explained by Newton's universal law of gravitation.
Step-by-step explanation:
When addressing the question of which statement is inaccurate about gravity, it is important to understand the fundamental principles of gravitational force. 'a) Only very large objects exert a gravitational force' is the incorrect statement because in reality, all objects with mass exert a gravitational force on each other, regardless of their size. This principle is encapsulated in Newton's universal law of gravitation, which states that every particle attracts every other particle with a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance between them. Gravity, being an attractive force that is always present, is what keeps planets in orbit, and indeed, is what holds you to Earth's surface. Without gravity, it would indeed be impossible to walk or perform any other activities that require traction against a surface.