Labs
Interactive tools for hands-on learning. Drag, adjust, explore. These are not animations you watch. You build intuition by doing.
Beam Loading Lab
Place point loads on a simply-supported beam and watch the shear force and bending moment diagrams update in real time.
1D Vector Builder
Add vectors on a number line and see tip-to-tail addition with the resultant.
2D Force Resolution
Drag the angle of a force vector and see its X and Y components update live. Explore how trigonometry connects angle to components.
Moment Explorer
Move a force around a point and see how the moment arm and resulting moment change. Drag the force point and adjust the angle.
Free Body Diagram Lab
Add forces to a rigid body, run a simulation, and watch the object move under their combined effect. Visualize moment arms and equilibrium conditions.
Inclined Plane Friction Lab
Explore static and kinetic friction on an angled surface. Adjust angle, mass, and friction coefficient to see when an object slides.
Projectile Launcher
Fire a projectile at any angle and speed. Compare multiple trajectories and see range, height, and time of flight update in real time.
Spring Oscillations
Set a mass-spring system in motion and watch it oscillate. Adjust mass and stiffness to see how they affect period and amplitude.
Gear Train & Ratios
Mesh gears of different sizes and watch the rotational speed and torque trade off. Explore compound gear trains for large ratio reductions.
Optics Bench
Place converging and diverging lenses on a virtual bench and trace rays from a light source. See how lens position and focal length create real and virtual images.
Prism & Dispersion
Aim a laser at a glass prism and watch white light split into a spectrum. Adjust the prism angle and see how each wavelength refracts differently.
Calculus Grapher
Plot any function and see its first and second derivatives drawn live below it. Move a cursor to read exact values at any point.
2D Equilibrium Solver
Build arbitrary 2D structures with points, parts, and connections. Apply forces and supports, then see reaction forces computed automatically with step-by-step solutions.
IUPAC Naming Walkthrough
Step through the IUPAC naming process for 14 molecules — from simple alkanes to chiral centers and multi-functional compounds.
VSEPR Geometry Explorer
Explore all 15 VSEPR molecular geometries in interactive 3D. Click any shape in the chart, then drag to rotate and scroll to zoom. See bond angles, lone pairs, and example molecules.
Substituent Library
Interactive reference for all common organic substituents (R groups). Browse by category, see structures, naming rules, abbreviations, and example molecules.
Periodic Table Explorer
Interactive periodic table with element properties, trend heatmaps for electronegativity, atomic radius, ionization energy, and quiz modes to test your knowledge.
Truss Explorer
Load preset truss configurations and see member forces calculated. Toggle between method of joints and method of sections views.
Pulley Systems
Build compound pulley systems and see how mechanical advantage multiplies. Add pulleys and observe the force reduction.
More tools
Concept Graph
4,000+ concepts mapped with prerequisite relationships across every course. See how everything connects. Search for any topic and trace its dependencies.
Career Match Quiz
30-question interest assessment that maps your preferences to 20+ engineering disciplines. Find out which fields match how you think.