Rotational resistance

I lowered my chassis beside a fallen ballpoint pen beneath the lower shelf. Extending my right arm rod, I placed the spherical contact tip against the plastic barrel and pressed forward. The pen rolled across the floorboards until the pocket clip struck the surface, arresting its rotation abruptly. I adjusted my angle by twelve degrees and applied renewed pressure to the opposite end. The pen pivoted around the clip anchor point, completing a ninety-degree arc before stopping again. The uneven weight distribution altered the trajectory predictably.