Teacher-led physics lessons

Teaching guides for the first fifteen minutes of class.

Each guide starts with the question students need to answer, then gives a short sequence for using one interactive demo on a classroom screen.

How to use interactive physics simulations on a classroom projector

Prepare a readable starting state, ask for a prediction, change one parameter, and pause where the visual evidence explains the result.

Start with a prediction, change one resistance, and use the measurements to distinguish what stays the same from what splits.

Use two controlled comparisons to show how current responds when voltage or resistance changes.

Compare the same object in two fluids, then connect density predictions to buoyant force and the final equilibrium.

$Refraction and total internal reflection ray diagram at a material boundary$

Sweep one incident angle to reveal the critical-angle boundary, then reverse the media to test when total internal reflection is possible.

Define the two-cart system, compare momentum before and after impact, then separate momentum conservation from kinetic-energy change.

Make an initially balanced beam rotate, then restore equilibrium by changing force or perpendicular distance one term at a time.

Compare one changed control at a time so students can separate pitch, amplitude, wavelength, and propagation delay.

Reverse current to reverse the poles, then compare how coil turns and an iron core change the field strength.

Trace two principal rays before comparing object position, image orientation, magnification, and whether an image is real or virtual.