"भौतिकी के सूत्र" (अनुभाग) सम्पादित करें

== द्रब्यमान केन्द्र एवं संघट्ट (Center of mass and collisions) ==
{| class="wikitable"
|-
|[[center of mass]] COM
|<math>\mathbf{r}_{com}=M^{-1}\Sigma m_i \mathbf{r}_i</math>
|-
| . . .
|<math>x_{com}=M^{-1}\int x dm, \cdots</math>
|-
|for constant density:
|<math>x_{com}=V^{-1}\int x dV, \cdots</math>
|-
|COM is in all planes of symmetry
|<math></math>
|-                                
|[[elastic collision]]
|<math>\Delta E_k = 0</math>
|-                                
|[[inelastic collision]]
|<math>\Delta E_k = </math>maximum
|-
|conservation of momentum in a two body collision
|<math>\mathbf{P}_{1i}+\mathbf{P}_{2i}=\mathbf{P}_{1f}+\mathbf{P}_{2f} </math>
|-
|system COM remains inert
|<math>\mathbf{v}_{com}={(\mathbf{P}_{1i}+\mathbf{P}_{2i})\over(M_1+M_2)} = const</math>
|-
|elastic collision, 1D, M2 stationary
|<math>v_{1f}={(m_1 - m_2)\over(m_1 + m_2)}v_{1i}</math>
|-
| . . .
|<math>v_{2f}={(2m_1)\over(m_1 + m_2)}v_{1i}</math>
|-
|}