Gravitational force is an attraction between masses. The strength of
the force is proportional to the masses and weakens rapidly with increasing
distance between them.
| NSES Content Standard B
Physical Science: Motions and forces Grades 9-12, page 180 Gravitation is a universal force that each mass exerts on any other mass. The strength of the gravitational attractive force between two masses is proportional to the masses and inversely proportional to the square of the distance between them. |