Everything that spins, pivots, and turns. Six episodes that take rotation from description through Newton's Laws to equilibrium and angular acceleration.
Episode Guide — Season 5
Unit 1 revisited — same three kinematic equations, new variables. Angular displacement, velocity, and acceleration describe every spinning object.
The bridge between spinning and moving. Radius r is the multiplier that converts every angular quantity into its linear counterpart at any point on a rigid system.
Force causes linear acceleration. Torque causes angular acceleration. Where you apply the force and at what angle determines how effectively it rotates a system.
Mass resists linear acceleration. Rotational inertia resists angular acceleration — and it depends on how far that mass sits from the axis, not just how much there is.
When net torque is zero, angular velocity stays constant. The rotational analog of Newton's First Law — and the key to every balance and seesaw problem.
F = ma for spinning systems becomes tau_net = I*alpha. The rotational version of the most powerful law in mechanics — and the season finale of Unit 5.