qwen3.5 wrote physics notes

notes/phys1/phys1_unit2.txt

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+== UNIT 2: FORCE AND TRANSLATIONAL DYNAMICS ==
+System: choose boundaries, internal forces cancel
+External forces cause system acceleration
+ΣF = ma (net force = mass x acceleration)
+Free-body diagram: ONLY external forces on chosen object
+Weight = mg (field force)
+Normal force: contact perpendicular, NOT always equal to weight
+Friction: kinetic = μ_k*F_N, static ≤ μ_s*F_N
+Friction opposes motion, direction opposite velocity
+Incline: resolve gravity into parallel (mg sin θ) and perpendicular (mg cos θ)
+Tension: pulls along string/rope, same throughout ideal rope
+Pulley: massless frictionless pulley transmits force unchanged
+Newton's 3rd Law: action-reaction pairs equal opposite different objects
+Mass vs weight: mass constant, weight depends on location
+Equilibrium: ΣF = 0, not necessarily zero velocity
+Terminal velocity: when drag = weight, a = 0, v constant