There is, therefore, a rigid relationship between the projectile speed of the marble and the time of travel before impact with the interrupting floor. If the line through space that the projectile draws is plotted on a graph, we see that it will describe an arc. And if there was no floor to stop its angular motion downward and it could continue its path of motion even through the Earth itself, we would then see that the angularity of its trajectory becomes ever more linear as it gets nearer to the earth's g-center. When an object moves in a curved path, the direction of its velocity changes constantly, and this change in direction also gives rise to an acceleration. A projectile arcing downward in its flight path, then, is constantly accelerating.
Rotational inertia is the resistance of a body to assume angular motion or once assumed to stop.
I will return to these confusing scribbles and attempt to clarify them. Torque is expressed in pound-feet. In general, if the forces applied to a body do not all act at a single point, there is the possibility that the body will rotate. If F is in pounds and h is in feet, the units for T will be foot-pounds. Torque arises from an applied force on an object.