Physics > Rotational Dynamics > 5.0 Rotational kinetic energy

  Rotational Dynamics
    1.0 Introduction
    2.0 Angular momentum or moment of a momentum
    3.0 Relation between torque and angular momentum
    4.0 Combined translational and rotational motion of a rigid body
    5.0 Rotational kinetic energy
    6.0 Uniform pure rolling
    7.0 Accelerated pure rolling
    8.0 Instantaneous axis of rotation
    9.0 Toppling

5.1 Total kinetic energy of a rigid body in a combined translational and rotational motion
In combined translation and rotational motion, the total kinetic energy $(K)$ of a rigid body is sum of the translational kinetic energy $\left( {{K_T}} \right)$ and the rotational kinetic energy $\left( {{K_R}} \right)$ $$\begin{equation} \begin{aligned} K = {K_T} + {K_R} \\ K = \frac{1}{2}mv_{com}^2 + \frac{1}{2}I{\omega ^2} \\\end{aligned} \end{equation} $$
where,
${v_{com}}$: Velocity of centre of mass
${I_{com}}$: Moment of inertia about an axis of rotation
$\omega $: Angular velocity about an axis of rotation

In the above case the axis of rotation is at the centre of mass. Therefore, $$K = \frac{1}{2}mv_{com}^2 + \frac{1}{2}{I_{com}}{\omega ^2}$$
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