Analyze the following statements regarding Newton’s Universal Law of Gravitation.
I. The gravitational force between two point masses acts along the line joining their centers.
II. The force is independent of the nature of the intervening medium between the masses.
III. The gravitational force forms an action-reaction pair, meaning F₁₂ = -F₂₁.
IV. Newton’s law is strictly valid for point masses and spherically symmetric bodies.
V. If a sheet of material is placed between two masses, the net gravitational force on one mass due to the other remains unchanged, but the resultant force on the mass changes due to the sheet.
