In this simulation, you can investigate the gravity field and the gravityc potential at various positions along a line, when there are either M1 moon and M2 Earth in a line. In particular, you can explore the connection between the field and the potential.
Real data of earth moon are used to construct this sim.
The field and potential are represented in two ways. First, the table at the bottom shows the values of the gravity field and gravity potential at the position of the masses. Values are given for the field and potential due to each charged particle individually, as well the net values.
The second way to represent the field and potential is graphically. You can look at both the graph of the gravity field as a function of position, as well as the graph of the gravity potential as a function of position. The graphs are probably most helpful in determining how field and potential are connected.
In addition, the arrows attached to the movable test charge show the gravity field at the position of the test mass from the two masses.