Dynamics Secret Agent – Infiltrating an Abandoned Factory                 Date : January 2015 Author : Olivier Tardif-Paradis, Mathieu Riopel College : Cégep Garneau Demonstrations : Centre de démonstration en sciences physiques Length : 2 - 3 hours Related concept(s) : Rotational kinematics, moment of inertia, moment of force, rotational dynamics of a rigid body around a fixed axis     In this activity, the students will try to slip a secret agent into a factory’s air duct. To do this, they have to determine the exact descent time of the platform the secret agent is standing on. The platform is attached to a cord, and the descent triggers the rotation of a radar antenna. The solution to the problem relies on the concepts of rotational dynamics.