Choice of pole

Competence — Choose the appropriate pole for calculating moments and angular momentum.

Appears in chapters

06 · 07

Linked atoms

13 linked atoms.

00 Physical quantities, estimates, equilibrium

• Rigid body and rotational equilibrium
• Worked example — Ladder leaning against a smooth wall
• Worked example — System with two masses and a pulley
• Worked example — Beam with two loads suspended by two ropes

06 Centre of mass

• Worked example — The door with two forces
• König’s theorem for angular momentum

07 Rotational dynamics

• Case 1: inelastic collision with a hinged rod
• Case 2: elastic collision with a hinged rod
• Worked example — projectile against a hinged rod
• Problem — Rotating disc struck tangentially
• When it is conserved: the choice of pole
• Collision of a projectile with a rod

08 Universal gravitation

• Conservation of angular momentum and Kepler’s second law