Question: what is the gravitational force between these two protons?
Answer: Example 2.1: Use Newton's Law of Gravitation to calculate the gravitational attraction between two protons separated by a distance of 1 fm (i.e. 10-15 m). This problem involves a simple substitution: F = Gmpmp/r2 = [6.67 x 10-11] [1.67 x 10-27]2 / [1 x 10-15]2 = 1.86 x 10-34 N. ... Although force is a vector quantity, Eqs.