This lab allows the user to visualise the gravitational force that two objects exert on each other. It is possible to change properties of the objects in order to see how that changes the gravitational force between them. The lab has the following goals: - To relate gravitational force to the masses of objects and the distance between objects. - To explain Newton's third law for gravitational forces. - To design experiments that allow the user to derive an equation that relates mass, distance, and gravitational force. - To use measurements to determine the universal gravitational constant.