Linear Momentum

2026-08-19 11:36:28 -04:00
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+[[Linear Momentum]]
+
+Total momentum of system stays the same when there is no external force acting on it.
+
+# Summary
+* Total momentum is vector sum
+* If net external force is 0, then momentum stays the same.
+* Momentum is conserved in every action
+* Nonzero net external force transfers momentum in or out of system, which is impulse.
+* Center of mass velocity stays constant when no external force.
+
+# Center of Mass Velocity
+$$\vec v_{cm}=\frac{\Sigma \vec p_i}{\Sigma m_i}$$
+Treats whole system like momentum is concentrated in one point.
+