Basic Adjustable Pulley Clamp Material_LDPE Simultaneous AC and DC output

Simultaneous AC and DC output on this low-voltage power supply

sized for two-cell battery-pack circuits and the standard ray-box and panel-lamp apparatus

Length-adjustable wooden pendulum simple-machine model with a blue bob sliding along the string and a wooden guide keeping the swing on a consistent path for period-vs-length measurements

fanning apart visibly when a charged rod approaches to demonstrate electrostatic repulsion and induction

Battery-free analog mechanical stopwatch reading to one-tenth of a second

Basic Adjustable Pulley Clamp Material_LDPE Simultaneous AC and DC outputNylon ball bearing adjustable clamp pulley supporting low friction rotation across varied rod and stand mounts, a flexible mounting option for pulley and force demonstrations.