Newton’s Law of Universal Gravitation

• F = gravitational force between two objects

• m1 = mass of first object

• m2 = mass of second object

• r = distance between objects

• G = universal constant of gravitation

• If the masses are measured in kilograms and the distance between them in meters, then the force is measured in newtons

• Laboratory experiments have yielded a value for G of

• G = 6.67 × 10–11 newton • m2/kg2