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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Space Physics Lab</title>
<style>
:root {
--primary-color: #4fc3f7;
--secondary-color: #0a192f;
--accent-color: #ff6b6b;
--light-bg: #0a192f;
--dark-text: #e6f1ff;
--light-text: #ffffff;
--success-color: #64ffda;
--warning-color: #ffd166;
}
body {
font-family: 'Orbitron', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
margin: 0;
padding: 0;
background-color: var(--light-bg);
color: var(--dark-text);
line-height: 1.6;
background-image:
radial-gradient(circle at 10% 20%, rgba(25, 55, 109, 0.8) 0%, transparent 20%),
radial-gradient(circle at 90% 80%, rgba(25, 55, 109, 0.8) 0%, transparent 20%),
url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100" viewBox="0 0 100 100"><circle cx="20" cy="30" r="1" fill="white" opacity="0.8"/><circle cx="50" cy="15" r="1" fill="white" opacity="0.6"/><circle cx="80" cy="40" r="1" fill="white" opacity="0.7"/><circle cx="10" cy="70" r="1" fill="white" opacity="0.5"/><circle cx="60" cy="80" r="1" fill="white" opacity="0.9"/><circle cx="90" cy="60" r="1" fill="white" opacity="0.4"/></svg>');
}
@import url('https://fonts.googleapis.com/css2?family=Orbitron:wght@400;500;700&display=swap');
.container {
max-width: 1200px;
margin: 0 auto;
padding: 20px;
}
header {
background-color: rgba(10, 25, 47, 0.9);
color: var(--light-text);
padding: 20px 0;
text-align: center;
margin-bottom: 30px;
box-shadow: 0 2px 20px rgba(100, 255, 218, 0.2);
border-bottom: 1px solid rgba(100, 255, 218, 0.3);
position: relative;
overflow: hidden;
}
header::before {
content: "";
position: absolute;
top: 0;
left: 0;
right: 0;
bottom: 0;
background:
radial-gradient(circle at 20% 30%, rgba(100, 255, 218, 0.1) 0%, transparent 20%),
radial-gradient(circle at 80% 70%, rgba(100, 255, 218, 0.1) 0%, transparent 20%);
pointer-events: none;
}
h1, h2, h3 {
margin: 0;
color: var(--light-text);
}
h1 {
font-size: 2.5rem;
margin-bottom: 10px;
text-shadow: 0 0 10px rgba(100, 255, 218, 0.5);
letter-spacing: 2px;
}
h2 {
font-size: 1.8rem;
margin-bottom: 20px;
text-align: center;
color: var(--primary-color);
text-shadow: 0 0 8px rgba(79, 195, 247, 0.5);
letter-spacing: 1px;
}
.card {
background-color: rgba(10, 25, 47, 0.8);
border-radius: 8px;
box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
padding: 25px;
margin-bottom: 30px;
border: 1px solid rgba(100, 255, 218, 0.2);
position: relative;
overflow: hidden;
}
.card::before {
content: "";
position: absolute;
top: 0;
left: 0;
right: 0;
height: 2px;
background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
animation: shine 3s infinite;
}
@keyframes shine {
0% { transform: translateX(-100%); }
100% { transform: translateX(100%); }
}
.tabs {
display: flex;
margin-bottom: 20px;
border-bottom: 1px solid rgba(100, 255, 218, 0.2);
}
.tab {
padding: 12px 20px;
background-color: rgba(20, 40, 80, 0.7);
border: none;
cursor: pointer;
border-radius: 5px 5px 0 0;
margin-right: 5px;
font-weight: 600;
transition: all 0.3s ease;
color: var(--dark-text);
font-family: 'Orbitron', sans-serif;
letter-spacing: 1px;
position: relative;
overflow: hidden;
}
.tab:hover {
background-color: rgba(79, 195, 247, 0.3);
color: var(--primary-color);
}
.tab.active {
background-color: var(--primary-color);
color: var(--secondary-color);
font-weight: 700;
}
.tab.active::after {
content: "";
position: absolute;
bottom: -1px;
left: 0;
right: 0;
height: 2px;
background-color: var(--success-color);
animation: pulse 2s infinite;
}
@keyframes pulse {
0% { opacity: 0.5; }
50% { opacity: 1; }
100% { opacity: 0.5; }
}
.tab-content {
display: none;
animation: fadeIn 0.5s ease;
}
.tab-content.active {
display: block;
}
@keyframes fadeIn {
from { opacity: 0; transform: translateY(10px); }
to { opacity: 1; transform: translateY(0); }
}
.simulator-container {
display: flex;
flex-wrap: wrap;
gap: 20px;
}
.simulator {
flex: 1;
min-width: 300px;
}
canvas {
background-color: rgba(10, 25, 47, 0.5);
border: 1px solid rgba(79, 195, 247, 0.3);
border-radius: 4px;
display: block;
margin: 0 auto;
max-width: 100%;
box-shadow: 0 0 20px rgba(79, 195, 247, 0.1);
}
.controls {
display: flex;
flex-wrap: wrap;
gap: 15px;
margin: 20px 0;
padding: 15px;
background-color: rgba(20, 40, 80, 0.5);
border-radius: 8px;
border: 1px solid rgba(79, 195, 247, 0.2);
}
.control-group {
flex: 1;
min-width: 200px;
background-color: rgba(10, 25, 47, 0.7);
padding: 15px;
border-radius: 6px;
box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
border: 1px solid rgba(79, 195, 247, 0.1);
}
.control-group h3 {
font-size: 1.2rem;
margin-bottom: 15px;
color: var(--primary-color);
padding-bottom: 8px;
border-bottom: 1px solid rgba(79, 195, 247, 0.3);
}
label {
display: block;
margin-bottom: 8px;
font-weight: 600;
color: var(--light-text);
}
input[type="range"] {
width: 100%;
margin-bottom: 15px;
-webkit-appearance: none;
height: 8px;
background: rgba(79, 195, 247, 0.2);
border-radius: 4px;
outline: none;
}
input[type="range"]::-webkit-slider-thumb {
-webkit-appearance: none;
appearance: none;
width: 18px;
height: 18px;
background: var(--primary-color);
border-radius: 50%;
cursor: pointer;
transition: all 0.2s ease;
box-shadow: 0 0 5px rgba(79, 195, 247, 0.8);
}
input[type="range"]::-webkit-slider-thumb:hover {
transform: scale(1.1);
background: var(--success-color);
box-shadow: 0 0 8px rgba(100, 255, 218, 0.8);
}
select {
width: 100%;
padding: 8px;
border: 1px solid rgba(79, 195, 247, 0.3);
border-radius: 4px;
margin-bottom: 15px;
font-size: 14px;
background-color: rgba(10, 25, 47, 0.8);
color: var(--light-text);
}
.button-group {
display: flex;
gap: 10px;
flex-wrap: wrap;
margin-top: 15px;
}
button {
background-color: var(--primary-color);
color: var(--secondary-color);
border: none;
padding: 10px 18px;
border-radius: 4px;
cursor: pointer;
transition: all 0.3s ease;
font-weight: 600;
font-size: 14px;
flex: 1;
min-width: 100px;
font-family: 'Orbitron', sans-serif;
letter-spacing: 1px;
position: relative;
overflow: hidden;
}
button:hover {
background-color: var(--success-color);
transform: translateY(-2px);
box-shadow: 0 4px 15px rgba(100, 255, 218, 0.4);
color: var(--secondary-color);
}
button:active {
transform: translateY(0);
}
button::before {
content: "";
position: absolute;
top: -50%;
left: -50%;
width: 200%;
height: 200%;
background: linear-gradient(
to bottom right,
rgba(255, 255, 255, 0) 0%,
rgba(255, 255, 255, 0) 37%,
rgba(255, 255, 255, 0.8) 45%,
rgba(255, 255, 255, 0) 50%,
rgba(255, 255, 255, 0) 100%
);
transform: rotate(30deg);
transition: all 0.3s;
opacity: 0;
}
button:hover::before {
animation: shine 1.5s infinite;
opacity: 1;
}
button.secondary {
background-color: rgba(79, 195, 247, 0.2);
color: var(--primary-color);
}
button.warning {
background-color: var(--warning-color);
color: var(--secondary-color);
}
button.success {
background-color: var(--success-color);
color: var(--secondary-color);
}
button.danger {
background-color: var(--accent-color);
color: var(--light-text);
}
.value-display {
display: inline-block;
min-width: 40px;
text-align: center;
background-color: rgba(79, 195, 247, 0.2);
padding: 3px 8px;
border-radius: 4px;
font-family: monospace;
margin-left: 5px;
color: var(--primary-color);
}
.data-panel {
flex: 1;
min-width: 300px;
background-color: rgba(10, 25, 47, 0.7);
border-radius: 8px;
padding: 20px;
box-shadow: 0 2px 15px rgba(0, 0, 0, 0.2);
border: 1px solid rgba(79, 195, 247, 0.2);
}
.data-panel h3 {
margin-bottom: 15px;
color: var(--primary-color);
}
.data-display {
height: 200px;
overflow-y: auto;
border: 1px solid rgba(79, 195, 247, 0.2);
padding: 10px;
margin-bottom: 15px;
font-family: monospace;
background-color: rgba(20, 40, 80, 0.3);
border-radius: 4px;
color: var(--light-text);
}
.data-display p {
margin: 5px 0;
color: var(--light-text);
}
.data-display span {
color: var(--primary-color);
font-weight: bold;
}
.graph-container {
height: 250px;
margin-top: 20px;
position: relative;
background-color: rgba(10, 25, 47, 0.5);
border-radius: 4px;
border: 1px solid rgba(79, 195, 247, 0.2);
}
.footer {
text-align: center;
margin-top: 40px;
padding: 20px 0;
color: rgba(230, 241, 255, 0.6);
font-size: 14px;
border-top: 1px solid rgba(79, 195, 247, 0.2);
}
@media (max-width: 768px) {
.simulator-container {
flex-direction: column;
}
.tab {
padding: 10px 15px;
font-size: 14px;
}
h1 {
font-size: 2rem;
}
h2 {
font-size: 1.5rem;
}
}
/* Tooltip styles */
.tooltip {
position: relative;
display: inline-block;
cursor: help;
}
.tooltip .tooltiptext {
visibility: hidden;
width: 200px;
background-color: rgba(10, 25, 47, 0.9);
color: var(--light-text);
text-align: center;
border-radius: 6px;
padding: 5px;
position: absolute;
z-index: 1;
bottom: 125%;
left: 50%;
transform: translateX(-50%);
opacity: 0;
transition: opacity 0.3s;
font-size: 14px;
font-weight: normal;
border: 1px solid rgba(79, 195, 247, 0.3);
}
.tooltip:hover .tooltiptext {
visibility: visible;
opacity: 1;
}
.hero-buttons {
display: flex;
justify-content: center;
padding-left: 20px;
margin-bottom: 15px;
}
.btn {
display: inline-block;
background-color: rgba(79, 195, 247, 0.2);
color: var(--primary-color);
padding: 10px 20px;
border-radius: 30px;
text-decoration: none;
font-weight: 600;
transition: all 0.3s;
border: 1px solid rgba(79, 195, 247, 0.3);
margin: 0 10px;
font-family: 'Orbitron', sans-serif;
letter-spacing: 1px;
}
.btn:hover {
background-color: var(--primary-color);
color: var(--secondary-color);
transform: translateY(-2px);
box-shadow: 0 4px 15px rgba(79, 195, 247, 0.4);
}
/* Space-themed animations */
@keyframes float {
0% { transform: translateY(0px); }
50% { transform: translateY(-10px); }
100% { transform: translateY(0px); }
}
.floating {
animation: float 6s ease-in-out infinite;
}
/* Glow effect for important elements */
.glow {
text-shadow: 0 0 10px rgba(79, 195, 247, 0.7);
}
/* Pulsing animation for active elements */
@keyframes pulse-glow {
0% { box-shadow: 0 0 5px rgba(79, 195, 247, 0.5); }
50% { box-shadow: 0 0 20px rgba(79, 195, 247, 0.9); }
100% { box-shadow: 0 0 5px rgba(79, 195, 247, 0.5); }
}
.pulse {
animation: pulse-glow 2s infinite;
}
</style>
</head>
<body>
<header class="floating">
<div class="hero-buttons">
<a href="front.html" class="btn"><i class="fas fa-atom"></i>Home</a>
<a href="quiz.html" class="btn"><i class="fas fa-atom"></i>Quiz</a>
</div>
<div class="container">
<h1 class="glow">Space Physics Lab</h1>
<p>Interactive simulations for exploring physics in space environments</p>
</div>
</header>
<div class="container">
<div class="card">
<div class="tabs">
<button class="tab active" data-tab="pendulum">Orbital Pendulum</button>
<button class="tab" data-tab="projectile">Planetary Projectile</button>
<button class="tab" data-tab="collision">Asteroid Collision</button>
<button class="tab" data-tab="spring">Zero-G Spring</button>
</div>
<!-- Pendulum Simulation -->
<div class="tab-content active" id="pendulum-tab">
<h2>Orbital Pendulum Simulation</h2>
<div class="simulator-container">
<div class="simulator">
<canvas id="pendulumCanvas" width="600" height="400"></canvas>
</div>
<div class="data-panel">
<h3>Pendulum Data</h3>
<div class="data-display" id="pendulumData">
<p>Period: <span id="pendulumPeriod">0.00</span> s</p>
<p>Frequency: <span id="pendulumFrequency">0.00</span> Hz</p>
<p>Max Velocity: <span id="pendulumMaxVelocity">0.00</span> m/s</p>
<p>Energy: <span id="pendulumEnergy">0.00</span> J</p>
</div>
<div class="graph-container">
<canvas id="pendulumGraph" height="200"></canvas>
</div>
</div>
</div>
<div class="controls">
<div class="control-group">
<h3>Pendulum Properties</h3>
<label for="length">Pendulum Length: <span id="lengthValue" class="value-display">100</span> cm</label>
<input type="range" id="length" min="20" max="300" value="100">
<label for="bobMass">Bob Mass: <span id="bobMassValue" class="value-display">1.0</span> kg</label>
<input type="range" id="bobMass" min="0.1" max="5" step="0.1" value="1.0">
</div>
<div class="control-group">
<h3>Environment</h3>
<label for="gravity">Gravity: <span id="gravityValue" class="value-display">9.8</span> m/s²</label>
<input type="range" id="gravity" min="1" max="20" step="0.1" value="9.8">
<label for="damping">Damping: <span id="dampingValue" class="value-display">0.995</span></label>
<input type="range" id="damping" min="0.9" max="1" step="0.001" value="0.995">
</div>
<div class="control-group">
<h3>Initial Conditions</h3>
<label for="angle">Initial Angle: <span id="angleValue" class="value-display">30</span>°</label>
<input type="range" id="angle" min="5" max="80" value="30">
<label for="pendulumColor">Bob Color:</label>
<select id="pendulumColor">
<option value="#4fc3f7">Nebula Blue</option>
<option value="#ff6b6b">Red Giant</option>
<option value="#64ffda">Quantum Green</option>
<option value="#ffd166">Stellar Yellow</option>
</select>
</div>
</div>
<div class="controls">
<div class="button-group">
<button id="startPendulum" class="success pulse">Start</button>
<button id="resetPendulum" class="secondary">Reset</button>
<button id="pausePendulum" class="warning">Pause</button>
<button id="recordDataPendulum">Record Data</button>
<button id="clearDataPendulum" class="danger">Clear Data</button>
</div>
</div>
</div>
<!-- Projectile Motion Simulation -->
<div class="tab-content" id="projectile-tab">
<h2>Planetary Projectile Simulation</h2>
<div class="simulator-container">
<div class="simulator">
<canvas id="projectileCanvas" width="600" height="400"></canvas>
</div>
<div class="data-panel">
<h3>Projectile Data</h3>
<div class="data-display" id="projectileData">
<p>Max Height: <span id="maxHeight">0.00</span> m</p>
<p>Range: <span id="range">0.00</span> m</p>
<p>Flight Time: <span id="flightTime">0.00</span> s</p>
<p>Impact Velocity: <span id="impactVelocity">0.00</span> m/s</p>
</div>
<div class="graph-container">
<canvas id="projectileGraph" height="200"></canvas>
</div>
</div>
</div>
<div class="controls">
<div class="control-group">
<h3>Projectile Properties</h3>
<label for="velocity">Initial Velocity: <span id="velocityValue" class="value-display">20</span> m/s</label>
<input type="range" id="velocity" min="5" max="50" value="20">
<label for="projectileMass">Projectile Mass: <span id="projectileMassValue" class="value-display">1.0</span> kg</label>
<input type="range" id="projectileMass" min="0.1" max="5" step="0.1" value="1.0">
</div>
<div class="control-group">
<h3>Launch Conditions</h3>
<label for="projectileAngle">Launch Angle: <span id="projectileAngleValue" class="value-display">45</span>°</label>
<input type="range" id="projectileAngle" min="5" max="85" value="45">
<label for="launchHeight">Launch Height: <span id="launchHeightValue" class="value-display">1.0</span> m</label>
<input type="range" id="launchHeight" min="0" max="10" step="0.1" value="1.0">
</div>
<div class="control-group">
<h3>Environment</h3>
<label for="projectileGravity">Gravity: <span id="projectileGravityValue" class="value-display">9.8</span> m/s²</label>
<input type="range" id="projectileGravity" min="1" max="20" step="0.1" value="9.8">
<label for="airResistance">Air Resistance: <span id="airResistanceValue" class="value-display">0.02</span></label>
<input type="range" id="airResistance" min="0" max="0.1" step="0.01" value="0.02">
</div>
</div>
<div class="controls">
<div class="button-group">
<button id="fireProjectile" class="success pulse">Launch</button>
<button id="resetProjectile" class="secondary">Reset</button>
<button id="showTrajectory">Show Trajectory</button>
<button id="recordProjectileData">Record Data</button>
<button id="compareTrajectories">Compare Trajectories</button>
</div>
</div>
</div>
<!-- Collision Physics Simulation -->
<div class="tab-content" id="collision-tab">
<h2>Asteroid Collision Simulation</h2>
<div class="simulator-container">
<div class="simulator">
<canvas id="collisionCanvas" width="600" height="400"></canvas>
</div>
<div class="data-panel">
<h3>System Data</h3>
<div class="data-display" id="collisionData">
<p>Total Kinetic Energy: <span id="totalKE">0.00</span> J</p>
<p>Total Momentum: <span id="totalMomentum">0.00</span> kg·m/s</p>
<p>Collisions: <span id="collisionCount">0</span></p>
<p>Asteroids: <span id="ballCount">5</span></p>
</div>
<div class="graph-container">
<canvas id="collisionGraph" height="200"></canvas>
</div>
</div>
</div>
<div class="controls">
<div class="control-group">
<h3>Collision Properties</h3>
<label for="elasticity">Elasticity: <span id="elasticityValue" class="value-display">0.8</span></label>
<input type="range" id="elasticity" min="0" max="1" step="0.1" value="0.8">
<label for="numBalls">Number of Asteroids: <span id="numBallsValue" class="value-display">5</span></label>
<input type="range" id="numBalls" min="2" max="15" step="1" value="5">
</div>
<div class="control-group">
<h3>Environment</h3>
<label for="collisionGravity">Gravity: <span id="collisionGravityValue" class="value-display">0.2</span> m/s²</label>
<input type="range" id="collisionGravity" min="0" max="1" step="0.1" value="0.2">
<label for="friction">Friction: <span id="frictionValue" class="value-display">0.99</span></label>
<input type="range" id="friction" min="0.9" max="1" step="0.01" value="0.99">
</div>
<div class="control-group">
<h3>Asteroid Properties</h3>
<label for="minRadius">Min Radius: <span id="minRadiusValue" class="value-display">15</span> px</label>
<input type="range" id="minRadius" min="5" max="30" step="1" value="15">
<label for="maxRadius">Max Radius: <span id="maxRadiusValue" class="value-display">35</span> px</label>
<input type="range" id="maxRadius" min="10" max="50" step="1" value="35">
</div>
</div>
<div class="controls">
<div class="button-group">
<button id="startCollision" class="success pulse">Start</button>
<button id="resetCollision" class="secondary">Reset</button>
<button id="addBall">Add Asteroid</button>
<button id="removeBall" class="danger">Remove Asteroid</button>
<button id="toggleCollisionData">Show Data</button>
</div>
</div>
</div>
<!-- Spring System Simulation -->
<div class="tab-content" id="spring-tab">
<h2>Zero-G Spring System</h2>
<div class="simulator-container">
<div class="simulator">
<canvas id="springCanvas" width="600" height="400"></canvas>
</div>
<div class="data-panel">
<h3>Spring Data</h3>
<div class="data-display" id="springData">
<p>Spring Constant: <span id="springKValue">100</span> N/m</p>
<p>Natural Length: <span id="springL0Value">100</span> px</p>
<p>Damping: <span id="springDampingValue">0.9</span></p>
<p>Mass: <span id="springMassValue">1.0</span> kg</p>
</div>
<div class="graph-container">
<canvas id="springGraph" height="200"></canvas>
</div>
</div>
</div>
<div class="controls">
<div class="control-group">
<h3>Spring Properties</h3>
<label for="springK">Spring Constant: <span id="springKValueDisplay" class="value-display">100</span> N/m</label>
<input type="range" id="springK" min="10" max="500" step="10" value="100">
<label for="springL0">Natural Length: <span id="springL0ValueDisplay" class="value-display">100</span> px</label>
<input type="range" id="springL0" min="50" max="200" step="5" value="100">
</div>
<div class="control-group">
<h3>Mass Properties</h3>
<label for="springMass">Mass: <span id="springMassValueDisplay" class="value-display">1.0</span> kg</label>
<input type="range" id="springMass" min="0.1" max="5" step="0.1" value="1.0">
<label for="springDamping">Damping: <span id="springDampingValueDisplay" class="value-display">0.9</span></label>
<input type="range" id="springDamping" min="0.5" max="1" step="0.01" value="0.9">
</div>
<div class="control-group">
<h3>Initial Conditions</h3>
<label for="springInitialDisplacement">Initial Displacement: <span id="springInitialDisplacementValue" class="value-display">50</span> px</label>
<input type="range" id="springInitialDisplacement" min="0" max="150" step="5" value="50">
<label for="springColor">Mass Color:</label>
<select id="springColor">
<option value="#4fc3f7">Nebula Blue</option>
<option value="#ff6b6b">Red Giant</option>
<option value="#64ffda">Quantum Green</option>
<option value="#ffd166">Stellar Yellow</option>
</select>
</div>
</div>
<div class="controls">
<div class="button-group">
<button id="startSpring" class="success pulse">Start</button>
<button id="resetSpring" class="secondary">Reset</button>
<button id="pauseSpring" class="warning">Pause</button>
<button id="addSpring">Add Spring</button>
<button id="recordSpringData">Record Data</button>
</div>
</div>
</div>
</div>
</div>
<footer class="footer">
<div class="container">
<p>Space Physics Lab © 2023 | Interactive Physics Simulations for Space Exploration</p>
</div>
</footer>
<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>
<script>
// Tab functionality
const tabs = document.querySelectorAll('.tab');
const tabContents = document.querySelectorAll('.tab-content');
tabs.forEach(tab => {
tab.addEventListener('click', () => {
const tabId = tab.getAttribute('data-tab');
tabs.forEach(t => t.classList.remove('active'));
tabContents.forEach(tc => tc.classList.remove('active'));
tab.classList.add('active');
document.getElementById(`${tabId}-tab`).classList.add('active');
// Reset all simulations when switching tabs
resetAllSimulations();
});
});
function resetAllSimulations() {
if (typeof resetPendulum === 'function') resetPendulum();
if (typeof resetProjectile === 'function') resetProjectile();
if (typeof resetCollision === 'function') resetCollision();
if (typeof resetSpring === 'function') resetSpring();
}
// Update all range value displays
document.querySelectorAll('input[type="range"]').forEach(range => {
const valueDisplay = document.getElementById(`${range.id}Value`);
if (valueDisplay) {
valueDisplay.textContent = range.value;
range.addEventListener('input', () => {
valueDisplay.textContent = range.value;
});
}
// Handle special cases for displays with different IDs
const displayId = `${range.id}Display`;
const displayElement = document.getElementById(displayId);
if (displayElement) {
displayElement.textContent = range.value;
range.addEventListener('input', () => {
displayElement.textContent = range.value;
});
}
});
// ============ PENDULUM SIMULATION ============
const pendulumCanvas = document.getElementById('pendulumCanvas');
const pendulumCtx = pendulumCanvas.getContext('2d');
const pendulumGraphCanvas = document.getElementById('pendulumGraph');
let pendulumChart = null;
let pendulumLength = 100;
let bobMass = 1.0;
let gravity = 9.8;
let angle = 30 * Math.PI / 180;
let angleVelocity = 0;
let angleAcceleration = 0;
let damping = 0.995;
let pendulumAnimationId = null;
let isPendulumRunning = false;
let bobColor = '#4fc3f7';
let pendulumData = [];
let startTime = 0;
let periodCount = 0;
let lastZeroCrossing = 0;
// Anchor point
const originX = pendulumCanvas.width / 2;
const originY = 50;
function drawPendulum() {
// Draw space background
pendulumCtx.fillStyle = '#0a192f';
pendulumCtx.fillRect(0, 0, pendulumCanvas.width, pendulumCanvas.height);
// Draw stars
drawStars(pendulumCtx, pendulumCanvas.width, pendulumCanvas.height);
// Calculate bob position
const bobX = originX + pendulumLength * Math.sin(angle);
const bobY = originY + pendulumLength * Math.cos(angle);
// Draw rod with glow effect
pendulumCtx.beginPath();
pendulumCtx.moveTo(originX, originY);
pendulumCtx.lineTo(bobX, bobY);
pendulumCtx.strokeStyle = bobColor;
pendulumCtx.shadowColor = bobColor;
pendulumCtx.shadowBlur = 10;
pendulumCtx.lineWidth = 3;
pendulumCtx.stroke();
pendulumCtx.shadowBlur = 0;
// Draw anchor
pendulumCtx.beginPath();
pendulumCtx.arc(originX, originY, 7, 0, Math.PI * 2);
pendulumCtx.fillStyle = '#64ffda';
pendulumCtx.shadowColor = '#64ffda';
pendulumCtx.shadowBlur = 5;
pendulumCtx.fill();
pendulumCtx.shadowBlur = 0;
// Draw bob with glow effect
pendulumCtx.beginPath();
pendulumCtx.arc(bobX, bobY, 20, 0, Math.PI * 2);
pendulumCtx.fillStyle = bobColor;
pendulumCtx.shadowColor = bobColor;
pendulumCtx.shadowBlur = 15;
pendulumCtx.fill();
pendulumCtx.shadowBlur = 0;
pendulumCtx.strokeStyle = '#e6f1ff';
pendulumCtx.lineWidth = 1;
pendulumCtx.stroke();
// Display info
pendulumCtx.fillStyle = '#e6f1ff';
pendulumCtx.font = '14px Orbitron';
pendulumCtx.fillText(`Angle: ${(angle * 180 / Math.PI).toFixed(1)}°`, 10, 30);
pendulumCtx.fillText(`Angular Velocity: ${angleVelocity.toFixed(3)} rad/s`, 10, 50);
// Calculate physics values
const currentTime = Date.now();
const elapsedTime = (currentTime - startTime) / 1000;
const bobVelocity = angleVelocity * pendulumLength / 100; // Convert to m/s
const potentialEnergy = bobMass * gravity * (pendulumLength / 100) * (1 - Math.cos(angle));
const kineticEnergy = 0.5 * bobMass * Math.pow(bobVelocity, 2);
const totalEnergy = potentialEnergy + kineticEnergy;
// Update data displays
document.getElementById('pendulumPeriod').textContent = (periodCount > 0 ? (elapsedTime / periodCount).toFixed(2) : '0.00');
document.getElementById('pendulumFrequency').textContent = (periodCount > 0 ? (periodCount / elapsedTime).toFixed(2) : '0.00');
document.getElementById('pendulumMaxVelocity').textContent = Math.abs(bobVelocity).toFixed(2);
document.getElementById('pendulumEnergy').textContent = totalEnergy.toFixed(2);
// Record data for chart
if (isPendulumRunning) {
pendulumData.push({
time: elapsedTime,
angle: angle * 180 / Math.PI,
velocity: angleVelocity,
energy: totalEnergy
});
// Limit data points to prevent memory issues
if (pendulumData.length > 500) {
pendulumData = pendulumData.slice(-500);
}
updatePendulumChart();
}
// Detect zero crossings for period calculation
if (angleVelocity * Math.sin(angle) < 0 && Math.abs(angle) < 0.1) {
if (lastZeroCrossing > 0 && elapsedTime - lastZeroCrossing > 0.5) {
periodCount++;
}
lastZeroCrossing = elapsedTime;
}
// Physics calculations
if (isPendulumRunning) {
angleAcceleration = -gravity / (pendulumLength / 100) * Math.sin(angle);
angleVelocity += angleAcceleration * 0.05; // Smaller time step for better accuracy
angleVelocity *= damping;
angle += angleVelocity * 0.05;
pendulumAnimationId = requestAnimationFrame(drawPendulum);
}
}
function drawStars(ctx, width, height, count = 100) {
ctx.fillStyle = '#ffffff';
for (let i = 0; i < count; i++) {
const x = Math.random() * width;
const y = Math.random() * height;
const radius = Math.random() * 1.5;
const opacity = Math.random();
ctx.beginPath();
ctx.arc(x, y, radius, 0, Math.PI * 2);
ctx.fillStyle = `rgba(255, 255, 255, ${opacity})`;
ctx.fill();
// Add twinkle effect to some stars
if (Math.random() > 0.9) {
ctx.shadowColor = '#ffffff';
ctx.shadowBlur = 5;
ctx.fill();
ctx.shadowBlur = 0;
}
}
}
function updatePendulumChart() {
if (!pendulumChart) {
pendulumChart = new Chart(pendulumGraphCanvas, {
type: 'line',
data: {
labels: pendulumData.map(d => d.time.toFixed(1)),
datasets: [
{