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Interactive simulations — grab, drag, explore real physics
Drag the bob, adjust gravity, damping, drive force
Stretch, release, watch harmonic oscillation
Does gravity change the period? (Spoiler: no!)
Compare spring combinations side by side
Coupled oscillators, normal modes, energy transfer
Drop a mass onto an oscillator — inelastic collision
99% of bullet energy lost — where did it go?
Three-phase jump: free fall, bungee engaged, slack bounce
Period independent of ramp angle — only equilibrium shifts
Coupled radial + angular modes with 2:1 resonance
Damping ratio ζ: underdamped vs critically damped vs overdamped
Slider-crank mechanism: piston height, cylinder volume, TDC/BDC
12-state 6-DOF model with PD hover control, thrust vectors, Euler angles
Does the scale read 100N or 200N? Tension misconception
Inverted pendulum stabilized by vibration
Coupled cart-pendulum on a spring track
Unstable equilibrium stabilized by LQR state-feedback control
Inclined plane — friction, force decomposition, FBD
Driven oscillator — frequency response, phase flip, Q factor
Person walks on a raft — CM stays fixed, raft drifts
Two masses, rope, pulley — tension, friction, coupled motion
2-6 atoms, spring types, orbits, wall bouncing
Lennard-Jones MD — solid, liquid, gas, phase transitions, heat
Draw circuits, see current flow and voltage colors live
Transfer function, Bode plot, step response of bridged T-coil
Design optical setups with lenses, mirrors, and ray tracing
Explore reflection, refraction, and lens behavior with live rays
4 balls race — cycloid always wins
Forward & inverse kinematics, Jacobian, singularities, trajectory tracking
Faraday's law: rotating coil, flux, EMF waveform, DC commutator
Build circuits with gates, truth tables, K-maps, and TTL ICs
6 boards, 21 components, QEMU emulation, 33 presets