Unit 5 · Torque and Rotational Dynamics

Chapter 5.3

Rotational Equilibrium and Newton's Second Law for Rotation

A diving board holds perfectly still with a swimmer on its tip, and the anchor at its back end is pulling the board down, not up. Stillness takes two separate promises.

lesson 17 of 18

By the end

  1. 01Solve rotational equilibrium problems — beams, ladders, hanging signs — about a well-chosen axis
  2. 02Explain how rotational and translational equilibrium can hold separately
  3. 03Apply the rotational second law, including a massive pulley coupled to a translating block

In unit 5

  1. 5.1Rotational Kinematics
  2. 5.2Torque and Rotational Inertia
  3. 5.3Rotational Equilibrium and Newton's Second Law for Rotation
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