I want to find out how hard two objects are pushing against each other from accelerating forces, even when they're stationary. Is there any way to do that?

You can create your own force field calculation `F=k/r^2=ma` where r is the distance between object A and object B, and k is proportional to the mass of object A and object B. You can then solve for acceleration using `a = k/r^2` and `k=G * m(a) * m(b)`