The refinements are almost done
eduLab AJC page:
download and also attached

1. change in area size to mass for visual impact, area change according to mass now.
2. clearer arrows of contact force, done.
3. some other fixes like better graphics control click 1 show all mom,ke,forces
4. mouse and elephant graphics, I doubt it helps but I will try with your pictures, you wish to provide your picture of a mouse and elephant?