Volume Density: Volume density (or mass density) measures the amount of mass per unit volume and is denoted by $\rho$. Units are typically $\text{kg}/\text{m}^3$.
Linear Density:Linear density measures mass per unit length and is represented by $\lambda$. Units are usually $\text{kg}/\text{m}$.
Moment of Inertia:$I = \int r^2 \, dm$, where \(r\) is the distance from the axis. It quantifies an object's resistance to rotational motion.