The time taken by a particle for one complete oscillation is known as periodic time.

The power developed by a body acted upon by a torque T newton metre (N - m) and revolving at ω radian/s is given by

The force, by which the body is attracted, towards the centre of the earth, is called

The resultant of two equal forces P making an angle θ, is given by

According to parallel axis theorem, the moment of inertia of a section about an axis parallel to the axis through centre of gravity (i.e. I_P) is given by(where, A = Area of the section, I_G = Moment of inertia of the section about an axis passing through its C.G., and h = Distance between C.G. and the parallel axis.)