Torque, Equilibrium & Rotational Motion — three ways to learn it.

The complete written lesson — rigid bodies, torque τ = rF sin θ with line of action & moment arm, couples, centre of gravity and the plumb-line practical, the two conditions of equilibrium, stable / unstable / neutral states, angular kinematics and v = rω — with six worked BIEK numericals.

As you scroll, a live panel animates every idea: the spanner shows a live τ readout as the angle and arm change, the see-saw balances when Στ hits zero, the cone topples or returns, three plumb lines pin down the CG — and the equilibrium section swaps in the real 3D force table you can operate yourself.

Balance forces on the force table, hang weights and explore the apparatus on a safe, virtual bench. All of the course's hands-on physics apparatus lives here.