qwen3.5 wrote physics notes

notes/phys1/phys1_unit3.txt

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+== UNIT 3: WORK, ENERGY, AND POWER ==
+Work done: W = F*d*cos(θ) where θ is angle between force and displacement
+Only force component parallel to displacement does work
+Negative work: force opposes motion (friction, air resistance)
+Work-energy theorem: net work = change in kinetic energy
+Kinetic energy: KE = 0.5*m*v^2
+Conservative force: work path independent (gravity, spring)
+Non-conservative force: work path dependent (friction)
+Gravitational PE: PE_g = m*g*Δh (only height change matters)
+Spring PE: PE_s = 0.5*k*x^2 where x is displacement from equilibrium
+Mechanical energy: E = KE + PE
+Conservation of energy: E_initial = E_final (if only conservative forces)
+Non-conservative work: W_nc = ΔKE + ΔPE
+Power: P = W/t (average) or P = F*v (instantaneous)
+Energy transfer via work
+Energy transfers between forms, never created/destroyed