Misconception: Skydiver goes up when parachute opens
When a parachute opens, many people think the parachutist suddenly shoots upward. This is not what really happens. The parachutist is always moving downward, but the parachute...
September 2025
Moving charge between two charged spheres
This simulation is made upon request by a colleague teaching JC2 this year. The motion of a mobile charge between two source charges is governed by Coulomb’s law ($F =...
A dynamics problem - apparent weight
This is a problem posed by a student today: A boy of mass 40 kg is standing on a weighing machine inside a lift which is moving upwards. At a certain moment, the speed of the lift...
Kinematics Equations - which to use?
When tackling kinematics problems, a quick way to decide which equation to use is to look carefully at which variables are given and which one you need to find. The four equations...
Electrostatic Precipitator Simulation
Interact with the simulation of an electrostatic precipitator (ESP) above. The ESP is a big air cleaner for factories and power plants. It uses electricity to pull tiny dust and...
RC Circuit
This is meant for the A-level topic of Circuits, for which students have to describe and represent the variation with time, of quantities like current, charge and potential...
Bouncing ball with energy loss
This simulation offers a clear and interactive way to explore the motion of a ball bouncing on the ground, highlighting how displacement, velocity, and acceleration change over...
Dropping with air resistance
This simulation lets you watch two equal-size spheres (light and heavy) fall, while you see their free-body diagrams (FBDs) and a velocity–time graph update in real time. Press...
3D view of forces on parallel currents using GeoGebra
The simulation serves to show how the magnetic field of one current-carrying wire exerts a force on another current-carrying wire. When two wires are placed parallel to each other...