Mechanics of Machinery
Dynamic modelling — Newton's method, the mass–spring–damper, natural frequency, building toward the robot-arm equation. 20 free topic pages.
Hydraulic & Pneumatic
Fluid power from first principles — how oil pressure makes force and motion. Stages 1–5 cover the fundamentals, the fluid, the lines that carry it, the pump that makes the flow, and the valves that control it; more coming.
Digital Logic Design
How a machine holds information in bits, and how gates turn them into arithmetic. Stages 1–4 cover numbers & codes, Boolean logic, K-map minimisation, and combinational blocks up to the ALU.
Physics 2 — Electricity & Magnetism
From a single charge to working circuits. Stages 1–3 cover electrostatics & Gauss's law, electric potential & capacitance, and current & DC circuits; magnetism and beyond coming.