$$ m\ddot{\varphi}_i + \dot{\varphi}_i = \omega + \frac{1}{N} \sum_{j = 1}^{N}\sin{(\varphi_j - \varphi_i - \alpha)}, \ i = \overline{1,N} $$
$$\text{Speed} $$
$$ \alpha $$
$$ \omega $$
$$ m $$
$$\text{Add items} $$
$$\text{Sub items} $$
$$\text{Impulse} $$