# A disc of mass M and radius R rotating around its symmetry axis with angular velocity

The simulation visually demonstrates the fundamental principle that torque, the rotational equivalent of force, causes a change in an object's angular velocity. When you apply a positive torque, the disc's angular velocity and angular momentum ( L ) increase, causing a faster counterclockwise rotation. Conversely, a negative torque decreases the angular velocity, causing the rotation to slow down or even reverse direction. This perfectly illustrates the rotational dynamics described by the equation: $$\tau=I \frac{d \omega}{d t}$$,where I is the moment of inertia.

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