According to Newton's law of gravitation, what is true about gravitational forces between two objects?

• A. Gravity acts only on Earth.
• B. Two objects always exert gravitational force on each other.
• C. Gravity acts the same regardless of distance.
• D. Gravitational force is always attractive and does not depend on distance.

Answer: (B)

Gravity is a universal force that pulls masses toward one another. Newton’s law states that every pair of objects with mass experiences a pull from the other, and the strength of that pull increases with the product of the masses and decreases with the square of the distance between them. This means two objects always exert gravitational forces on each other, no matter what they are or where they are, though the force becomes weaker as they are farther apart. Therefore, describing gravity as a mutual force between two masses is the correct idea. The other statements fail because gravity is not limited to Earth, it does depend on distance, and although it is attracted, the strength of that attraction changes with distance rather than staying constant.