Law of rotation:
If an object rotates purely about an axis S with angular acceleration and net torque operating on the body about s is ts, then - ts = Iα
rotational work and energy:
The rotational work given by a force about the fixed axis of rotation is shown as, 
Where the torque is given by the force, and is the infinitesimally small angular displacement about the axis.
The rotational kinetic energy of an object about a fixed rotational axis is described as,
Krot= 1/2lω2
Work-Energy Theorem: In complete analog to the work energy theorem for the translator motion, it may be stated for rotational motion as: Wrot = Krot
The net rotational work given by the forces is same to the modification in rotational kinetic energy of the object.
Conservation of Mechanical Energy: In the presence of dissipative work done by non-conservative forces, the total mechanical energy of a object is saved.
ΔK+ΔU = 0 Or Kf + Uf = Ki + Ui
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