The Scientist Lounge: new simulations New interactive physics simulations as they go live. https://thescientistlounge.com/ 2026-06-14T00:00:00-05:00 Launcher on a Platform https://thescientistlounge.com/sims/projectile-launcher-platform 2026-06-14T00:00:00-05:00 2026-06-14T00:00:00-05:00 A cart rolls at constant speed and fires a ball straight up; the ball inherits the cart's horizontal velocity and lands right back in the moving cart. Banked Curve https://thescientistlounge.com/sims/banked-curve 2026-06-11T00:00:00-05:00 2026-06-11T00:00:00-05:00 A car on a banked curve at adjustable angle and friction; find the ideal speed where no friction is needed. Pendulum Energy Bars https://thescientistlounge.com/sims/pendulum-energy-bars 2026-06-10T00:00:00-05:00 2026-06-10T00:00:00-05:00 A swinging pendulum with KE and PE bars exchanging; total energy stays flat without friction, decays with damping Conical Pendulum https://thescientistlounge.com/sims/conical-pendulum 2026-06-04T00:00:00-05:00 2026-06-04T00:00:00-05:00 A ball on a string traces a horizontal circle; tension and centripetal force decompose with adjustable string angle Connected Carts on a Rope https://thescientistlounge.com/sims/connected-carts-rope 2026-06-02T00:00:00-05:00 2026-06-02T00:00:00-05:00 Two carts connected by a rope, with one pulled by an external force; tension is identical throughout Elevator Apparent Weight https://thescientistlounge.com/sims/elevator-apparent-weight 2026-06-02T00:00:00-05:00 2026-06-02T00:00:00-05:00 A person on a scale inside an accelerating elevator; the scale reading changes with elevator acceleration Normal Force on an Incline https://thescientistlounge.com/sims/normal-force-incline 2026-06-02T00:00:00-05:00 2026-06-02T00:00:00-05:00 Block on an incline with adjustable angle; normal force decreases as cosine of the angle Terminal Velocity https://thescientistlounge.com/sims/terminal-velocity 2026-06-02T00:00:00-05:00 2026-06-02T00:00:00-05:00 An object falling through fluid with quadratic drag reaches terminal velocity that depends on mass and cross-section. Two-Rope Tension https://thescientistlounge.com/sims/two-rope-tension 2026-06-01T00:00:00-05:00 2026-06-01T00:00:00-05:00 A load hangs from two ropes at adjustable angles; each rope's tension is shown as a labelled vector and a force triangle that closes at equilibrium. Coulomb's Law https://thescientistlounge.com/sims/coulombs-law-two-charges 2026-05-28T00:00:00-05:00 2026-05-28T00:00:00-05:00 Two point charges with adjustable signs and magnitudes: the electrostatic force vector follows F = kq₁q₂/r² and flips direction when charge signs differ. Newton's Third Law: Pushing Carts https://thescientistlounge.com/sims/newtons-third-law-carts 2026-05-27T00:00:00-05:00 2026-05-27T00:00:00-05:00 Two carts pushed apart by an equal internal spring force: equal and opposite impulses leave total momentum at zero, while the lighter cart reaches proportionally greater speed. Free-Body Diagram Builder https://thescientistlounge.com/sims/free-body-diagram-builder 2026-05-27T00:00:00-05:00 2026-05-27T00:00:00-05:00 Place an object on an inclined surface with friction and an applied force; all force vectors render live with labeled magnitudes. Free Fall on Different Planets https://thescientistlounge.com/sims/free-fall-different-planets 2026-05-20T00:00:00-05:00 2026-05-20T00:00:00-05:00 Drop an object on Earth, Moon, Mars, or Jupiter with adjustable g and matching fall times Projectile on an Incline https://thescientistlounge.com/sims/projectile-incline 2026-05-20T00:00:00-05:00 2026-05-20T00:00:00-05:00 Launch a projectile up an adjustable slope and discover the angle that maximises range: the optimum generalises to θ = 45° + φ/2. Projectile from a Cliff https://thescientistlounge.com/sims/projectile-from-cliff 2026-05-20T00:00:00-05:00 2026-05-20T00:00:00-05:00 Projectile launched from elevated platform with adjustable height, angle, and speed; trajectory and impact point shown Circular Motion Vectors https://thescientistlounge.com/sims/circular-motion-vectors 2026-05-20T00:00:00-05:00 2026-05-20T00:00:00-05:00 An object on a circular track with live position, velocity (tangent), and centripetal acceleration vectors. Period vs Radius https://thescientistlounge.com/sims/period-vs-radius 2026-05-20T00:00:00-05:00 2026-05-20T00:00:00-05:00 Adjust the radius of a uniform circular orbit at fixed speed; period and frequency update live with the visualization. Catch the Falling Cat https://thescientistlounge.com/sims/catch-the-falling-cat 2026-05-17T00:00:00-05:00 2026-05-17T00:00:00-05:00 A firefighter's net-launcher aims dead-on at a cat perched on a ledge that drops the instant the net fires; both fall together under gravity, so a direct aim always catches the cat. Puck on Ice https://thescientistlounge.com/sims/newtons-first-law-puck 2026-05-15T00:00:00-05:00 2026-05-15T00:00:00-05:00 A puck sliding on ice with a logarithmic friction slider spanning three decades (μk = 0.0001 to 0.1): from idealized frictionless through real hockey-puck-on-ice to rough/worn ice, watch inertia in action. Friction on an Incline https://thescientistlounge.com/sims/friction-on-incline 2026-05-15T00:00:00-05:00 2026-05-15T00:00:00-05:00 A block on an inclined plane: adjust the angle and friction coefficients to find the exact angle at which slipping begins. Feather and Hammer https://thescientistlounge.com/sims/feather-and-hammer 2026-05-11T00:00:00-05:00 2026-05-11T00:00:00-05:00 A feather and hammer dropped together with adjustable air density, from perfect vacuum to full atmosphere. Two Runners Position https://thescientistlounge.com/sims/two-runners-position 2026-05-10T00:00:00-05:00 2026-05-10T00:00:00-05:00 Two runners with adjustable starting points and constant speeds; the simulation stops when the first runner crosses the 100 m finish line. Velocity-Time Plotter https://thescientistlounge.com/sims/velocity-time-plotter 2026-05-10T00:00:00-05:00 2026-05-10T00:00:00-05:00 A cart with adjustable constant acceleration; a dual-axis chart plots velocity (left axis, blue) and position (right axis, green) against time, with the shaded triangle showing that area-under-v equals displacement. Average vs Instantaneous Velocity https://thescientistlounge.com/sims/average-vs-instantaneous-velocity 2026-05-10T00:00:00-05:00 2026-05-10T00:00:00-05:00 A position-time curve with a draggable secant line that shrinks to a tangent, illustrating the limit definition of instantaneous velocity. Constant Acceleration Cart https://thescientistlounge.com/sims/constant-acceleration-cart 2026-05-10T00:00:00-05:00 2026-05-10T00:00:00-05:00 A cart with constant acceleration; live position, velocity, and acceleration plots update side by side Variable Acceleration https://thescientistlounge.com/sims/variable-acceleration 2026-05-10T00:00:00-05:00 2026-05-10T00:00:00-05:00 Adjust a peak-acceleration slider to shape a piecewise-linear acceleration-time profile; the simulation integrates it in real time to reveal velocity and position, the graphical meaning of kinematic integration. 1D Motion Plotter https://thescientistlounge.com/sims/1d-motion-plotter 2026-05-06T00:00:00-05:00 2026-05-06T00:00:00-05:00 An object moves along a line; set initial position and velocity with sliders and watch a live position-vs-time graph trace the result. Bounce on Grass vs. Turf https://thescientistlounge.com/sims/bounce-grass-turf 2026-05-03T00:00:00-05:00 2026-05-03T00:00:00-05:00 Drop a ball, watch it bounce and roll; pick grass, turf, or wet grass and see how the surface alone changes the outcome. Corner Kick into the Box https://thescientistlounge.com/sims/corner-kick-box 2026-05-03T00:00:00-05:00 2026-05-03T00:00:00-05:00 Top-down corner kick with Magnus curl, drag, and wind. Land the ball in a target zone at the far post. Magnus Effect Free Kick https://thescientistlounge.com/sims/magnus-free-kick 2026-05-03T00:00:00-05:00 2026-05-03T00:00:00-05:00 Curl a free kick around a wall: Magnus force perpendicular to velocity, plus quadratic drag. Top-down half-pitch with goal at 30 m. Penalty Kick: Speed vs. Keeper Reaction https://thescientistlounge.com/sims/penalty-kick-keeper 2026-05-03T00:00:00-05:00 2026-05-03T00:00:00-05:00 An 11-metre shot becomes a race of two clocks: ball travel time vs goalkeeper reaction plus dive. Tune both sides and see when each wins. Foot–Ball Collision https://thescientistlounge.com/sims/foot-ball-collision 2026-05-03T00:00:00-05:00 2026-05-03T00:00:00-05:00 Watch the foot strike the ball: a closed-form impulse model from foot mass, foot speed, and the coefficient of restitution. 2D Collision https://thescientistlounge.com/sims/2d-collision 2026-05-03T00:00:00-05:00 2026-05-03T00:00:00-05:00 Two objects colliding at angles in two dimensions with adjustable masses and velocities. Escape Velocity https://thescientistlounge.com/sims/escape-velocity 2026-04-29T00:00:00-05:00 2026-04-29T00:00:00-05:00 A projectile launched from a planet surface showing the threshold speed to escape gravity. Damped Spring https://thescientistlounge.com/sims/damped-spring 2026-04-29T00:00:00-05:00 2026-04-29T00:00:00-05:00 A spring-mass system with adjustable damping showing underdamped, critical, and overdamped motion. Torque & Lever https://thescientistlounge.com/sims/torque-lever 2026-04-27T00:00:00-05:00 2026-04-27T00:00:00-05:00 A lever with movable masses demonstrating torque balance and rotational equilibrium. Inclined Plane https://thescientistlounge.com/sims/inclined-plane 2026-04-26T00:00:00-05:00 2026-04-26T00:00:00-05:00 An object sliding down an adjustable incline with friction and normal force vectors. Atwood Machine https://thescientistlounge.com/sims/atwood-machine 2026-04-22T00:00:00-05:00 2026-04-22T00:00:00-05:00 Two masses connected by a string over a pulley demonstrating Newton's second law; adjust the masses to see how the weight difference drives acceleration. Projectile with Drag https://thescientistlounge.com/sims/projectile-drag 2026-04-22T00:00:00-05:00 2026-04-22T00:00:00-05:00 A projectile launched with adjustable air resistance showing the effect of drag on trajectory. Double Pendulum https://thescientistlounge.com/sims/double-pendulum 2026-04-22T00:00:00-05:00 2026-04-22T00:00:00-05:00 Two connected pendulums exhibiting chaotic motion under gravity: tiny differences in starting angles produce wildly different paths. Friction and Forces https://thescientistlounge.com/sims/friction-block 2026-04-20T00:00:00-05:00 2026-04-20T00:00:00-05:00 A block slides on a surface with adjustable static and kinetic friction coefficients; explore how friction affects motion and stopping distance. Rolling Disk https://thescientistlounge.com/sims/rolling-disk 2026-04-19T00:00:00-05:00 2026-04-19T00:00:00-05:00 A disk rolling down an incline showing rotational and translational motion; adjust the angle and radius to explore the rolling constraint. Orbital Motion https://thescientistlounge.com/sims/orbital-motion 2026-04-17T00:00:00-05:00 2026-04-17T00:00:00-05:00 A planet orbiting a star showing gravitational force and orbital velocity; adjust orbit radius and star mass to explore Kepler's laws. Inelastic Collision https://thescientistlounge.com/sims/inelastic-collision 2026-04-16T00:00:00-05:00 2026-04-16T00:00:00-05:00 Two objects collide and stick together; watch momentum stay conserved while kinetic energy is lost to deformation. Spring-Mass System https://thescientistlounge.com/sims/spring-mass 2026-04-13T00:00:00-05:00 2026-04-13T00:00:00-05:00 A mass on a spring demonstrating Hooke's law and undamped simple harmonic motion; adjust spring constant, mass, initial velocity, and amplitude to explore conservation of energy. Circular Motion https://thescientistlounge.com/sims/circular-motion 2026-04-09T00:00:00-05:00 2026-04-09T00:00:00-05:00 An object moving in a circle showing centripetal force and velocity vectors; adjust radius, speed, and mass to explore the relationships. Projectile Motion https://thescientistlounge.com/sims/projectile 2026-04-08T00:00:00-05:00 2026-04-08T00:00:00-05:00 Launch an object and watch it fly; adjust speed and angle to explore range and height. Vertical Drop https://thescientistlounge.com/sims/drop 2026-04-08T00:00:00-05:00 2026-04-08T00:00:00-05:00 Drop an object and see how height, air resistance, and mass affect the fall. Elastic Collision https://thescientistlounge.com/sims/elastic-collision 2026-04-08T00:00:00-05:00 2026-04-08T00:00:00-05:00 Two balls collide on a frictionless track; watch momentum and kinetic energy stay perfectly conserved through every bounce. Curved Ramp https://thescientistlounge.com/sims/ramp 2026-04-08T00:00:00-05:00 2026-04-08T00:00:00-05:00 A frictionless ball slides down a curved ramp; change the shape and watch the speed change. Simple Pendulum https://thescientistlounge.com/sims/simple-pendulum 2026-04-08T00:00:00-05:00 2026-04-08T00:00:00-05:00 A pendulum swinging under gravity with adjustable length and initial angle.