Which comes back to the physics of it all. As University of Virginia politics Prof. Larry J. Sabato is fond of saying, the two most powerful forces in politics are inertia and gravity, in that order.

Testing quantised inertia on the emdrive. arXiv:1604.03449 [physics.gen-ph] (2016) Paper: M. E. McCulloch. Modelling the Pioneer anomaly as modified inertia. MNRAS,376,338-342 (2007) ...

This classroom demonstration was meant to make physics more exciting for high school ... popular physic experiment demonstrating the law of inertia. The energy of the swinging object (in this ...

What you're actually feeling, though, is just the rock's inertia. The law of inertia says that something in motion will tend to stay in motion, and what's more, to move in a straight line.