each other, is subordinated to the gravitation which they have towards their shared central bodies.
Towards each other, then, their motion is external and contingent; the cause of the motion is thrust
and pressure. In this common mechanical motion the size of the mass, which has no meaning in the
fall, and the resistance, which the size achieves through its particular constitution, are moments of
determination. But because this motion contradicts the essential relation of the dependent body,
namely, that relation to its central body, it suspends itself through itself in rest. This necessity of the
concept appears, however, in the sphere of externality, as an external impediment or friction.
The law of inertia is initially taken from the nature of the motion of dependent bodies, for which the