From 0b7baaa446163c525e2cc3e8cd3d7fc20d09ea93 Mon Sep 17 00:00:00 2001 From: johnruina Date: Mon, 17 Aug 2026 08:24:02 -0400 Subject: [PATCH] 2026-08-17 08:24:01: Work --- .obsidian/graph.json | 2 +- .obsidian/workspace.json | 66 +++++++++++-------- literacy/buzzwords.md | 3 +- physics/Work Energy and Power/Work.md | 36 ++++++++++ physics/acceleration.md | 7 -- physics/kinesmatics formulas.md | 11 ---- physics/kinesmatics.md | 2 - ...andom math shit i probably need to know.md | 1 - physics/schrodinger equations.md | 4 -- 9 files changed, 79 insertions(+), 53 deletions(-) create mode 100644 physics/Work Energy and Power/Work.md delete mode 100644 physics/acceleration.md delete mode 100644 physics/kinesmatics formulas.md delete mode 100644 physics/kinesmatics.md delete mode 100644 physics/random math shit i probably need to know.md delete mode 100644 physics/schrodinger equations.md diff --git a/.obsidian/graph.json b/.obsidian/graph.json index 100e296..a17b427 100644 --- a/.obsidian/graph.json +++ b/.obsidian/graph.json @@ -17,6 +17,6 @@ "repelStrength": 18.5634118967452, "linkStrength": 1, "linkDistance": 52, - "scale": 0.6711465777142124, + "scale": 1.1103605584768275, "close": true } \ No newline at end of file diff --git a/.obsidian/workspace.json b/.obsidian/workspace.json index d2ce0a0..5182b5a 100644 --- a/.obsidian/workspace.json +++ b/.obsidian/workspace.json @@ -76,9 +76,23 @@ "icon": "lucide-file", "title": "Translational Kinetic Energy" } + }, + { + "id": "f0185690f07606fe", + "type": "leaf", + "state": { + "type": "markdown", + "state": { + "file": "physics/Work Energy and Power/Work.md", + "mode": "source", + "source": false + }, + "icon": "lucide-file", + "title": "Work" + } } ], - "currentTab": 4 + "currentTab": 5 }, { "id": "25da4f0a48a8e7cd", @@ -262,43 +276,43 @@ "obsidian-excalidraw-plugin:New drawing": false } }, - "active": "c320b38b4fa41973", + "active": "f0185690f07606fe", "lastOpenFiles": [ - "physics/Work Energy and Power/Work Energy and Power.md", "physics/Work Energy and Power/Translational Kinetic Energy.md", - "physics/Force and Translational Dynamics/Spring Force.md", - 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"biology/Cell Structure and Function/Cell Structure and Function.md", "Assets/Pasted image 20260816065000.png", - "math/calculus.md", "Assets/Pasted image 20260816065016.png", - "math/derivatives.md", "biology/Cell Structure and Function", "Assets/Pasted image 20260814125859.png", "Assets/Pasted image 20260815093612.png", - "literacy/fallacies.md", "Assets/Pasted image 20260814131131.png", "physics/Force and Translational Dynamics", "Assets/Pasted image 20260813174454.png", diff --git a/literacy/buzzwords.md b/literacy/buzzwords.md index 46a519e..02e101b 100644 --- a/literacy/buzzwords.md +++ b/literacy/buzzwords.md @@ -18,4 +18,5 @@ perforate - penetrate hale - to compel to go / (archaic) to pull draw drag or hoist incongruence - out of place/absurd olfactory - part of sensory system used for smells -nebulous - misty/foggy/mysterious \ No newline at end of file +nebulous - misty/foggy/mysterious +umbra - shadowy part \ No newline at end of file diff --git a/physics/Work Energy and Power/Work.md b/physics/Work Energy and Power/Work.md new file mode 100644 index 0000000..6297d85 --- /dev/null +++ b/physics/Work Energy and Power/Work.md @@ -0,0 +1,36 @@ +[[Work Energy and Power]] + +# Summary +* Work transfers energy in or out of a system. It's a scalar. +* $W=fd\cos \theta$ for constant forces. +* Work equals $F_{||}$ versus displacement integral. +* Conservative forces do path independent work that is zero in a full loop and stays the same no matter what path is taken to the endpoint (e.g. gravity) while non-conservative forces care about the path taken (e.g. air resistance). +* Net work = $\Delta K = \Sigma W_i$ + +## Conservative vs Non Conservative +* Potential energy is conservative only +* examples of conservative are gravity and spring +* Conservative essentially means the work done only changes mechanical energy + +* Non conservatives do work that convert mechanical energy into things like thermal energy (e.g. friction) +* Usually converted to sound or thermal energy + +Work by a constant force formula: $$W=F_{||}d=Fd\cos \theta$$ +$W$ is in joules +$F$ is force in newtons +$d$ is displacement +$\theta$ is the angle between the force and displacement vector + +Net work is the sum of work done by each force: $W_{net}=\Sigma F_{||,i}d$ + +Parallel component: $F_{||}=F\cos \theta$ + +Parallel component: $F_{\perp}=F\sin \theta$ + +Work-Energy Theorem: +$$\Delta K=\Sigma_iW_i=\frac{1}{2}mv^2_f-\frac{1}{2}mv^2_i$$ +Net work = change in kinetic energy + +For friction the mechanical energy lost to friction is modelled as: $$\Delta E_{mech}=F_fd\cos\theta$$ +When friction acts in the opposite direction to the motion (it usually is) the equation is modelled as: $$\Delta E_{mech}=-F_fd$$ +Work equals integral of the parallel force component $F_{||}$ versus d diff --git a/physics/acceleration.md b/physics/acceleration.md deleted file mode 100644 index a3fbd72..0000000 --- a/physics/acceleration.md +++ /dev/null @@ -1,7 +0,0 @@ -[[kinesmatics]] -a vector quantity that describes a change in velocity, denoted as $a$ or $\vec a$ -accel is to velocity as velocity is to position -second derivative of position - -$\vec a_{avg}= \frac{\Delta v}{\Delta t}$ -$\vec v_{avg}=\frac{\Delta d}{\Delta t}$ diff --git a/physics/kinesmatics formulas.md b/physics/kinesmatics formulas.md deleted file mode 100644 index a4e414a..0000000 --- a/physics/kinesmatics formulas.md +++ /dev/null @@ -1,11 +0,0 @@ -[[kinesmatics]] - -$v_{{avg}}=\Delta d / \Delta t$ -$a_{{avg}}= \Delta v / \Delta t$ -$d=d_2-d_1$ -$d=v_1t+\frac{1}{2}at^2$ -$d=v_2t-\frac{1}{2}at^2$ -$d=\frac{1}{2}(v_1+v_2)*t$ -$v_2=v_1+at$ -$v_2^2=v_1^2+2ad$ - diff --git a/physics/kinesmatics.md b/physics/kinesmatics.md deleted file mode 100644 index 6d525d1..0000000 --- a/physics/kinesmatics.md +++ /dev/null @@ -1,2 +0,0 @@ -[[physics]] -stuff like velocity vectors yadiyadiyada diff --git a/physics/random math shit i probably need to know.md b/physics/random math shit i probably need to know.md deleted file mode 100644 index 5547faf..0000000 --- a/physics/random math shit i probably need to know.md +++ /dev/null @@ -1 +0,0 @@ -[[physics]] \ No newline at end of file diff --git a/physics/schrodinger equations.md b/physics/schrodinger equations.md deleted file mode 100644 index 3aa399c..0000000 --- a/physics/schrodinger equations.md +++ /dev/null @@ -1,4 +0,0 @@ -[[quantum mechanics]] - -time independent equation: -$$\hat{H}\psi = E\psi$$