From e4b3f3c32d0a1574f48c0a8e0fae898812a65ab4 Mon Sep 17 00:00:00 2001
From: johnruina <codyyhuang@gmail.com>
Date: Fri, 21 Aug 2026 11:27:14 -0400
Subject: [PATCH] vault backup: 2026-08-21 11:27:13

---
 .obsidian/workspace.json                      | 44 +++++++++----------
 physics/Fluids/Fluid and Conservation Laws.md |  2 +-
 .../Rotational Inertia.md                     |  2 +
 3 files changed, 25 insertions(+), 23 deletions(-)

diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json
index dfcaabf..8c84043 100644
--- a/.obsidian/workspace.json
+++ b/.obsidian/workspace.json
@@ -28,12 +28,12 @@
             "state": {
               "type": "markdown",
               "state": {
-                "file": "Physics/Fluids/Fluid and Conservation Laws.md",
+                "file": "Physics/Work Energy and Power/Power.md",
                 "mode": "source",
                 "source": false
               },
               "icon": "lucide-file",
-              "title": "Fluid and Conservation Laws"
+              "title": "Power"
             }
           }
         ],
@@ -224,32 +224,32 @@
   },
   "active": "ca462f3fa811b1ff",
   "lastOpenFiles": [
-    "Physics/Thermodynamics.md",
-    "Physics/thermal expansion.md",
-    "Physics/quantum mechanics.md",
-    "Physics/plancks constant.md",
-    "Physics/Physics AP Exam Tips.md",
-    "Physics/Fluids/Fluid and Conservation Laws.md",
+    "Physics/Work Energy and Power/Potential Energy.md",
+    "Physics/Oscillations/Energy of Simple Harmonic Oscillators.md",
+    "Physics/Oscillations/Defining Simple Harmonic Motion (SHM).md",
+    "Physics/Oscillations/Frequency and Period of SHM.md",
+    "Physics/Oscillations/Representing and Analyzing SHM.md",
+    "Physics/Oscillations/Oscillations.md",
+    "Physics/Force and Translational Dynamics/Force and Translational Dynamics.md",
+    "Physics/Force and Translational Dynamics/Forces and Freebody Diagrams.md",
+    "Physics/Force and Translational Dynamics/Conservation of Energy.md",
+    "Physics/Force and Translational Dynamics/Circular Motion.md",
+    "Physics/Fluids/Fluid and Newton Laws.md",
+    "Physics/Fluids/Fluids.md",
     "Physics/Fluids/Pressure.md",
     "Physics/Fluids/Internal Structure and Density.md",
-    "ROOT.md",
-    "Physics/Oscillations/Energy of Simple Harmonic Oscillators.md",
-    "Physics/Oscillations/Representing and Analyzing SHM.md",
-    "Physics/Oscillations/Frequency and Period of SHM.md",
-    "Physics/Oscillations/Defining Simple Harmonic Motion (SHM).md",
-    "Physics/Oscillations/Oscillations.md",
+    "Physics/Fluids/Fluid and Conservation Laws.md",
     "Physics/Torque and Rotational Dynamics/Rotational Inertia.md",
-    "Physics/Torque and Rotational Dynamics/Torque.md",
-    "Physics/Fluids/Fluid and Newton Laws.md",
-    "Physics/Torque and Rotational Dynamics/Torque and Rotational Dynamics.md",
-    "Physics/Torque and Rotational Dynamics/Connecting Linear and Rotational Motion.md",
     "Physics/Torque and Rotational Dynamics/Newton's Second Law in Rotational Form.md",
     "Physics/Torque and Rotational Dynamics/Rotational Equilibrium and Newton's First Law in Rotational Form.md",
     "Physics/Torque and Rotational Dynamics/Rotational Kinematics.md",
-    "Physics/Fluids/Fluids.md",
-    "Biology/Biology.md",
-    "Chemistry/Chemistry.md",
-    "Literacy/Literacy.md",
+    "Physics/Torque and Rotational Dynamics/Connecting Linear and Rotational Motion.md",
+    "Physics/Torque and Rotational Dynamics/Torque.md",
+    "Physics/Work Energy and Power/Translational Kinetic Energy.md",
+    "Physics/Work Energy and Power/Power.md",
+    "Physics/Work Energy and Power/Work Energy and Power.md",
+    "Physics/Work Energy and Power/Work.md",
+    "Physics/Linear Momentum/Linear Momentum.md",
     "Physics/Fluids",
     "Physics/Oscillations",
     "Physics/Torque and Rotational Dynamics",
diff --git a/physics/Fluids/Fluid and Conservation Laws.md b/physics/Fluids/Fluid and Conservation Laws.md
index 24821e6..bd52342 100644
--- a/physics/Fluids/Fluid and Conservation Laws.md	
+++ b/physics/Fluids/Fluid and Conservation Laws.md	
@@ -2,7 +2,7 @@
 
 # Summary
 * Pressure difference between fluids causes flow.
-* $A_1v_1=A_2v_2$ expresses conservation of mass. Narrow area force faster speeds to incompressible fluids.
+* Continuity equation: $A_1v_1=A_2v_2$ expresses conservation of mass. Narrow area force faster speeds to incompressible fluids.
 * Bernoulli's equation: $P_1+pgy_1+\frac{1}{2}pv_1^2=P_1+pgy_2+\frac{1}{2}pv_2^2$ expresses conservation of energy along a streamline.
 * Faster fluid has lower pressure and vice versa
 * Torricelli's theorem: $v=\sqrt{2g\Delta y}$ is derived from energy conservation and gives exit speed of draining fluid.
diff --git a/physics/Torque and Rotational Dynamics/Rotational Inertia.md b/physics/Torque and Rotational Dynamics/Rotational Inertia.md
index 815a2e0..ed3479c 100644
--- a/physics/Torque and Rotational Dynamics/Rotational Inertia.md	
+++ b/physics/Torque and Rotational Dynamics/Rotational Inertia.md	
@@ -7,6 +7,8 @@ r is radial distance
 Several discrete objects:
 $$I_{tot}=\Sigma I_i=\Sigma m_i r^2$$
 
+Kinetic energy from rotation formula:
+$$KE_{rot}=\frac{1}{2}Iw^2$$
 # Parallel Axis Theorem
 Essentially shifting the axis and calculating the new inertia.
 $$I'=I_{cm}+Md^2$$