{"job_id":"anim-job-315dd198-7807-41e5-b55b-9e89e28edce4","request_id":"bulk-2026-05-21T06-14-14-458Z-3-a1-physics.08.friction.static-to-kinetic","status":"complete","asset":{"primary_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-315dd198-7807-41e5-b55b-9e89e28edce4/walkthrough.mp4","thumbnail_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-315dd198-7807-41e5-b55b-9e89e28edce4/thumb.jpg","transcript_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-315dd198-7807-41e5-b55b-9e89e28edce4/transcript.vtt","interactive_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-315dd198-7807-41e5-b55b-9e89e28edce4/index.html","scenefile_url":"https://storage.googleapis.com/pupiltree-animation-assets/anim-job-315dd198-7807-41e5-b55b-9e89e28edce4/scene-source.json","duration_seconds":15,"byte_size":469586,"renderer":"html_three_js_local","parameters":{"style":"auto","executor":"native_render_executor","localPath":"/app/storage/assets/anim-job-315dd198-7807-41e5-b55b-9e89e28edce4","interactivity":"none","renderer_style":"three_js","durationSeconds":15,"render_manifest":{"jobId":"anim-job-315dd198-7807-41e5-b55b-9e89e28edce4","request":{"gap":{"topic":"friction-static_to_kinetic","severity":"moderate","error_type":"concept_misunderstanding","memory_state":"fragile","display_topic":"Static to Kinetic Friction","common_wrong_answer":"The concept works the same way in all conditions.","confidence_at_error":"high","correct_understanding":"The concept depends on constraints, assumptions, and variable relationships."},"target":{"style":"auto","render":{"fps":30,"format":"mp4","resolution":"1920x1080","include_thumbnail":true,"include_transcript":true},"audience":{"tone":"neutral_instructional","grade":"8","language":"en"},"interactivity":"none","duration_seconds":15},"context":{"chapter":{"name":"Friction","ncert_class":8},"sub_topics":[{"topic":"friction-static_to_kinetic","key_concepts":["Static to Kinetic Friction","Friction"]}]},"metadata":{"priority":"normal","trace_id":"bulk-run-2026-05-21T06-14-14-458Z"},"exam_type":"neet","asset_type":"simulation","request_id":"bulk-2026-05-21T06-14-14-458Z-3-a1-physics.08.friction.static-to-kinetic","subject_area":"physics"},"renderer":"html_three_js_local","storyboard":{"beats":[{"label":"Topic","visual":"Show the topic title and the key physical context.","narration":"Static to Kinetic Friction"},{"label":"Mistake","visual":"Show the wrong approach and why it seems plausible.","narration":"The concept works the same way in all conditions."},{"label":"Correction","visual":"Show the right approach step by step.","narration":"The concept depends on constraints, assumptions, and variable relationships."},{"label":"Concept","visual":"Highlight the key formula and the governing relationship.","narration":"Static to Kinetic Friction. Friction"}],"title":"Static to Kinetic Friction","sceneCode":"<!doctype html>\n<html lang=\"en\">\n<head>\n  <meta charset=\"utf-8\"/>\n  <meta name=\"viewport\" content=\"width=device-width, initial-scale=1\"/>\n  <title>Static vs Kinetic Friction</title>\n  <style>\n    :root{--bg:#101417;--panel:#1c232e;--line:#3b4a55;--accent:#e0b15b;--text:#f3f7fa;--muted:#a8b4bf;--blue:#4ea8ff;--green:#8decb0;--red:#df8279;}\n    *{box-sizing:border-box;}\n    body{margin:0;font-family:\"Plus Jakarta Sans\",\"Manrope\",\"Inter\",ui-sans-serif,system-ui,sans-serif;background:radial-gradient(120% 90% at 20% -5%,#2a3944 0%,var(--bg) 58%);color:var(--text);}\n    main{min-height:100vh;display:grid;grid-template-columns:minmax(300px,380px) 1fr;}\n    aside{border-right:1px solid var(--line);background:linear-gradient(180deg,rgba(28,35,46,.86),rgba(14,18,26,.94));padding:24px;overflow:auto;backdrop-filter:blur(6px);}\n    section{padding:24px;display:grid;place-items:center;}\n    h1{margin:0 0 10px;font-size:1.65rem;line-height:1.15;}\n    .sub{margin:0 0 16px;color:var(--muted);}\n    .formula{margin:0 0 14px;padding:10px;border:1px solid var(--line);border-radius:10px;background:#162029;color:var(--accent);font-family:ui-monospace,monospace;font-size:0.9rem;box-shadow:inset 0 0 28px rgba(224,177,91,.14);}\n    .control{display:grid;gap:6px;margin:12px 0;}\n    .control input{width:100%;accent-color:var(--accent);}\n    ul{margin:14px 0 0 18px;padding:0;color:var(--muted);display:grid;gap:6px;}\n    .stage{width:min(1020px,95%);aspect-ratio:16/9;border:1px solid #4b6170;border-radius:14px;position:relative;overflow:hidden;background:radial-gradient(circle at 50% 38%,#3f6272,#141b22 72%);box-shadow:0 18px 60px rgba(0,0,0,.42), inset 0 0 90px rgba(255,255,255,.05);}\n    .stage::before{content:\"\";position:absolute;inset:0;background:linear-gradient(180deg,rgba(255,255,255,.06),transparent 34%);pointer-events:none;}\n    .legend{position:absolute;right:12px;top:12px;padding:8px 10px;border-radius:10px;border:1px solid #465a64;background:rgba(9,14,18,.58);font-size:0.8rem;color:var(--muted);backdrop-filter:blur(4px);}\n    @media(max-width:900px){main{grid-template-columns:1fr;}aside{border-right:0;border-bottom:1px solid var(--line);}}\n  </style>\n</head>\n<body>\n<main>\n  <aside>\n    <h1>Static vs Kinetic Friction</h1>\n    <p class=\"sub\">Why friction strength changes at the motion threshold</p>\n    <p class=\"formula\">f_s ≤ μ_s·N  |  f_k = μ_k·N</p>\n    <label class=\"control\"><span>Applied Force: <strong id=\"v-force\">0.5</strong> N</span><input id=\"c-force\" type=\"range\" min=\"0\" max=\"2\" step=\"0.05\" value=\"0.5\"/></label>\n    <label class=\"control\"><span>Friction Coeff: <strong id=\"v-mu\">0.7</strong> (μ)</span><input id=\"c-mu\" type=\"range\" min=\"0.3\" max=\"1.2\" step=\"0.05\" value=\"0.7\"/></label>\n    <label class=\"control\"><span>Mass: <strong id=\"v-mass\">2</strong> kg</span><input id=\"c-mass\" type=\"range\" min=\"1\" max=\"5\" step=\"0.2\" value=\"2\"/></label>\n    <ul>\n      <li><strong>❌ Misconception:</strong> Friction is always the same strength</li>\n      <li><strong>✓ Truth:</strong> Static friction varies up to μ_s·N, then drops when motion starts</li>\n      <li><strong>Why:</strong> At rest, friction matches applied force. Once moving, kinetic friction (μ_k·N) takes over—usually <em>lower</em></li>\n      <li><strong>Key:</strong> Watch the force graph jump down when motion begins</li>\n    </ul>\n  </aside>\n  <section>\n    <div class=\"stage\" id=\"stage\">\n      <div class=\"legend\" id=\"legend\">Ready</div>\n      <canvas id=\"sim-cv\" style=\"position:absolute;inset:0;width:100%;height:100%;\"></canvas>\n    </div>\n  </section>\n</main>\n<script>\nconst controls = [\n  {\"key\":\"force\",\"label\":\"Applied Force\",\"min\":0,\"max\":2,\"step\":0.05,\"value\":0.5,\"units\":\"N\"},\n  {\"key\":\"mu\",\"label\":\"Friction Coeff\",\"min\":0.3,\"max\":1.2,\"step\":0.05,\"value\":0.7,\"units\":\"\"},\n  {\"key\":\"mass\",\"label\":\"Mass\",\"min\":1,\"max\":5,\"step\":0.2,\"value\":2,\"units\":\"kg\"}\n];\nfor(const c of controls){\n  const inp=document.getElementById('c-'+c.key);\n  const out=document.getElementById('v-'+c.key);\n  inp?.addEventListener('input',()=>{out.textContent=inp.value;window.updateModel?.();});\n}\n(function(){\n  const cv=document.getElementById('sim-cv');\n  const ctx=cv.getContext('2d');\n  function resize(){const r=cv.getBoundingClientRect();if(r.width>0){cv.width=r.width;cv.height=r.height;}}\n  resize();new ResizeObserver(resize).observe(cv);\n  let lastTs=0;\n  \n  // State\n  let pos=0, vel=0, isMoving=false;\n  let forceHist=[], frictionHist=[], timeHist=[];\n  let cycleTime=0;\n  const MAX_HISTORY=240;\n  \n  function glowDot(x,y,r,color,a){\n    const g=ctx.createRadialGradient(x,y,0,x,y,r*2.6);\n    g.addColorStop(0,color.replace('ALPHA',String(a)));\n    g.addColorStop(1,color.replace('ALPHA','0'));\n    ctx.fillStyle=g;ctx.beginPath();ctx.arc(x,y,r*2.6,0,Math.PI*2);ctx.fill();\n  }\n  \n  function arrow(x1,y1,x2,y2,color,width){\n    const dx=x2-x1,dy=y2-y1,l=Math.sqrt(dx*dx+dy*dy);\n    if(l<2)return;\n    const nx=dx/l,ny=dy/l,s=12;\n    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isMoving=true;\n        vel=0.01; // tiny nudge to start\n      }else{\n        f_friction=F_app; // static matches applied\n      }\n    }\n    \n    if(isMoving){\n      f_friction=f_kinetic;\n      accel=(F_app-f_friction)/mass;\n      vel+=accel*dt;\n      pos+=vel*dt;\n      \n      if(F_app<f_kinetic*0.95 && vel<0.05){\n        isMoving=false;\n        vel=0;\n      }\n    }\n    \n    // History for graphs\n    forceHist.push(f_friction);\n    timeHist.push(cycleTime);\n    if(forceHist.length>MAX_HISTORY){\n      forceHist.shift();\n      timeHist.shift();\n    }\n    \n    // === DRAW ===\n    ctx.clearRect(0,0,W,H);\n    \n    // Background grid\n    ctx.strokeStyle='rgba(59,74,85,0.2)';ctx.lineWidth=1;\n    for(let i=0;i<W;i+=60){ctx.beginPath();ctx.moveTo(i,0);ctx.lineTo(i,H);ctx.stroke();}\n    \n    // Title section\n    const titleFontSize=Math.round(H*0.05);\n    ctx.fillStyle='#E0B15B';ctx.font='bold '+titleFontSize+'px sans-serif';\n    ctx.textAlign='left';ctx.fillText('Block on Surface',24,titleFontSize+8);\n    ctx.font='italic '+Math.round(H*0.032)+'px sans-serif';ctx.fillStyle='#A8B4BF';\n    const modeText=isMoving?'KINETIC friction (moving)':'STATIC friction (at rest)';\n    ctx.fillStyle=isMoving?'#8decb0':'#E0B15B';\n    ctx.fillText(modeText,24,titleFontSize+32);\n    \n    // === Diagram: Block, forces ===\n    const diag_y=H*0.28;\n    const diag_x_base=W*0.15;\n    const block_w=40, block_h=30;\n    const block_x=diag_x_base;\n    \n    // Ground\n    ctx.strokeStyle='#7a8a95';ctx.lineWidth=3;\n    ctx.beginPath();ctx.moveTo(diag_x_base-20,diag_y+70);ctx.lineTo(diag_x_base+200,diag_y+70);ctx.stroke();\n    ctx.strokeStyle='#465a64';ctx.lineWidth=1;\n    for(let i=0;i<200;i+=12){\n      ctx.beginPath();ctx.moveTo(diag_x_base-20+i,diag_y+70);ctx.lineTo(diag_x_base-20+i-6,diag_y+80);ctx.stroke();\n    }\n    \n    // Block\n    const blockColor=isMoving?'#8decb0':'#E0B15B';\n    ctx.fillStyle=blockColor;ctx.globalAlpha=0.85;\n    ctx.fillRect(block_x,diag_y+30,block_w,block_h);ctx.globalAlpha=1;\n    ctx.strokeStyle=blockColor;ctx.lineWidth=2;\n    ctx.strokeRect(block_x,diag_y+30,block_w,block_h);\n    \n    // Label\n    ctx.fillStyle='#F3F7FA';ctx.font='bold '+Math.round(H*0.03)+'px sans-serif';\n    ctx.textAlign='center';ctx.fillText('m',block_x+block_w/2,diag_y+55);\n    \n    // Applied force arrow\n    const f_arrow_len=F_app*40;\n    arrow(block_x+block_w+5,diag_y+45,block_x+block_w+5+f_arrow_len,diag_y+45,'#4EA8FF',3);\n    ctx.fillStyle='#4EA8FF';ctx.font=Math.round(H*0.028)+'px sans-serif';\n    ctx.textAlign='left';ctx.fillText('F_app',block_x+block_w+10,diag_y+20);\n    \n    // Friction force arrow (opposite direction)\n    const friction_arrow_len=f_friction*40;\n    if(friction_arrow_len>1){\n      arrow(block_x-5,diag_y+45,block_x-5-friction_arrow_len,diag_y+45,'#DF8279',3);\n      ctx.fillStyle='#DF8279';ctx.font=Math.round(H*0.028)+'px sans-serif';\n      ctx.textAlign='right';ctx.fillText('f_friction',block_x-10,diag_y+20);\n    }\n    \n    // Motion indicator\n    if(isMoving){\n      ctx.strokeStyle='#8decb0';ctx.lineWidth=2;ctx.globalAlpha=0.6;\n      const wave_y=diag_y+65;\n      ctx.beginPath();\n      for(let i=0;i<60;i+=8){\n        const wx=block_x+20+i-Math.sin(cycleTime*8+i/5)*3;\n        const wy=wave_y+Math.cos(cycleTime*8+i/5)*3;\n        if(i===0)ctx.moveTo(wx,wy);\n        else ctx.lineTo(wx,wy);\n      }\n      ctx.stroke();ctx.globalAlpha=1;\n    }\n    \n    // Normal force (downward)\n    arrow(block_x+block_w/2,diag_y+60,block_x+block_w/2,diag_y+100,'#A8B4BF',2);\n    ctx.fillStyle='#A8B4BF';ctx.font=Math.round(H*0.026)+'px sans-serif';\n    ctx.textAlign='center';ctx.fillText('N',block_x+block_w/2+12,diag_y+90);\n    \n    // === Force graph on right ===\n    const graph_x=W*0.52;\n    const graph_y=H*0.1;\n    const graph_w=W*0.42;\n    const graph_h=H*0.35;\n    \n    // Graph background\n   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