1. Moment of inertia of the particle
Review a rotating particle. The particle with mass m is given the force F so that the particle rotates about the axis O. The particle is r apart from the axis of rotation. First, the particle is in rest (v = 0). After moved by the force of F, the particles move with a certain speed so that the particles have tangential acceleration. The relationship between force (F), mass (m), and the tangential acceleration of particles are expressed by equation 3:
د یو واحد مثبت چارج لخوا تولید شوي بریښنایی ساحه محاسبه کولو لپاره، لومړی ګام دا دی چې د ګاس کروی سطحه د r شعاع سره غوره کړئ چیرې چې د کره مرکز په واحد چارج کې وي. د بال سطحه مساحت 4πr دی.2.