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
![1919_Rotational work and energy.png](https://www.expertsmind.com/../CMSImages/1919_Rotational work and energy.png)
rotational work and energy:
The rotational work given by a force about the fixed axis of rotation is shown as, ![2262_Rotational work and energy1.png](https://www.expertsmind.com/CMSImages/2262_Rotational%20work%20and%20energy1.png)
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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