Define Newtons law of Gravitation (in words or an equation).

Newtons law of gravitation can be described as: The force experienced by a body proportional to the product of the two masses the interaction is between, the gravitational constant 6.67x10^-11 , and the inverse square of their seperation (distance between the two objects centre of mass).
Equation: F = (GMm)/r² where "F" is Force, "G" is the constant, "M" and "m" are the masses, and "r" is the seperation.