First use the left mouse button to place the fixed masses, six of them. This will result in some curvature of the space. Then with a seventh click of the left mouse button, place the test mass at the horizontal cursor position in the 1D space. The initial velocity of the test mass is zero. One of the features of matter in the one dimensional space we created is its ability to occupy the same space with other matter at the same time. This makes the inevitable collisions when we only have one dimension, less troublesome.

The size of the fixed masses is indicated by a the green spot at each location. The test mass is shown in two forms. The red ball gives the position of the test mass as seen by the inhabitants of the one dimensional space. All they notice is that it goes faster as it approaches one of the fixed masses and slower as it leaves one.

The gray representation of the test mass shows its true location, including the non-distance dimension. For we who are observing from the outside, it is no mystery why the test mass goes faster sometimes than others. Our system is conservative so total mechanical energy is conserved. As the potential energy becomes more negative the kinetic energy must increase to maintain the total.