Today we began rotational motion in earnest in AP physics class today. Specifically, we followed up on a lab activity to derive the equation for torque. Students seemed comfortable with the idea with torque as the product of the perpendicular component of the Force and the Lever Arm.
Today was the nuts and bolts of naming terms assigning variables and using analogous reasoning to learn the various torque equations.
To make moment of inertia more intuitive, we went outside and had students line up, hold hands and sweep out a circle. Specifically students near the center of the circle barely had to move, and those at the edge were running to keep up. This led us to a more intuitive grasp of the fact that the moment of inertia I=mR2.
We are ready to begin AP problems and the toilet paper challenge next week.