{ "schema": "physics-anim-scene", "version": 1, "annotations": { "version": 2, "strokes": [] }, "physicsEnvironment": { "schema": "physics-anim-environment", "version": 1, "constants": { "pixelsPerMeter": 800, "gravityAcceleration": 9.8, "coulombK": 8987551792.3 } }, "pixelsPerMeter": 800, "gravityAcceleration": 9.8, "coulombK": 8987551792.3, "timeScale": 0.5, "view": { "x": 310.8263853141802, "y": 139.25006336803818, "scale": 0.6585249725487888 }, "canvasBackground": { "mode": "coordinate", "origin": { "x": 0, "y": 0 } }, "entities": [ { "id": 90, "type": "RichTextEditor", "state": { "pos": { "x": 360, "y": 65 }, "width": 660, "height": 100, "text": "## 测量小车加速度 · 纸带逐差法\n小车质量 0.50 kg，水平恒力 0.50 N，初速度为零。", "imageDataUrl": "", "imageName": "", "imageFit": "contain", "imagePosition": "top", "imageHeight": 92, "backgroundColor": "#ffffff", "backgroundOpacity": 0.96, "textColor": "#163047", "fontSize": 16, "fontWeight": 400, "fontFamily": "sans-serif", "textAlign": "left", "lineHeight": 1.45, "padding": 18, "borderColor": "#cbd5e1", "borderWidth": 1, "cornerRadius": 10, "showBorder": true, "locked": true } }, { "id": 1, "type": "MechanicsCart", "state": { "pos": { "x": -92.52829460096133, "y": 329.98961505779675 }, "vel": { "x": 0, "y": 0 }, "angle": 0, "omega": 0, "wheelAngleLeft": 0, "wheelAngleRight": 0, "wheelOmegaLeft": 0, "wheelOmegaRight": 0, "wheelRadius": 12, "wheelBase": 64, "wheelLocalY": 20, "rollingResistance": 0, "noSlipRolling": true, "width": 100, "height": 36, "hookSide": "right", "mass": 0.5, "baseMass": 0.5, "frontBackWidthM": 1, "fluidInteractionEnabled": true, "fluidManualCalibrationEnabled": false, "fluidEffectiveDepthM": 0, "fluidVolumeM3": 0, "fluidReferenceAreaM2": 0, "fluidDragCoefficient": -1, "fluidLinearDragCoefficientNsM": -1, "useGravity": false, "elasticityCoefficient": 0, "friction": 0, "frictionMode": "simple", "frictionBindings": [], "color": "#2563eb", "strokeColor": "#1864ab", "trayColor": "#dbeafe", "wheelColor": "#334155", "locked": false, "loadedWeightIds": [], "showForces": false, "forceDisplayAtCoM": false, "showVelocityVector": true, "showAccelerationVector": false, "showTrail": false, "maxTrail": 100, "trailUnlimited": false } }, { "id": 4, "type": "TickerTimer", "state": { "pos": { "x": 30, "y": 342.5349692364562 }, "enabled": true, "targetEntityId": "1", "mode": "tape", "displayModeManual": true, "tapeFrontMode": "target", "intervalSec": 0.02, "frequencySource": "internal", "coilResistanceOhm": 120, "minimumDriveVoltageRms": 1, "highlightEveryEnabled": true, "majorEvery": 5, "axisMode": "fixed", "axisDeg": 0, "autoAlignToTape": true, "maxPoints": 1000, "tapeLength": 420, "tapeWidth": 48, "tapeScale": 1, "dotRadius": 2.8, "dotColor": "#212529", "majorDotColor": "#dc3545", "trackColor": "#d63384", "tapeColor": "#ffffff", "showTrackLine": true, "showLabels": false, "showStats": true, "showTapeScale": true, "locked": false } }, { "id": 5, "type": "Ruler", "state": { "pos": { "x": 649.4030941567275, "y": 411.2349692364562 }, "length": 1567.606188313455, "thickness": 24, "angleDeg": 0, "unit": "cm", "minorStep": 1, "majorEvery": 10, "showTicks": true, "showNumbers": true, "showMeasure": true, "showEntityMarkers": false, "entityMarkersSelectedOnly": false, "commonGraduation": false, "fillColor": "#f8fafc", "strokeColor": "#64748b", "opacity": 1, "locked": false } }, { "id": 6, "type": "Stopwatch", "state": { "pos": { "x": 620, "y": 180 }, "width": 148, "height": 84, "displayStyle": "digital", "enabled": false, "controlMode": "main", "timeScale": 1, "precisionSec": 0.01, "zeroSimTime": 0, "heldSec": 0, "showDial": false, "faceColor": "#f8f9fa", "caseColor": "#343a40", "accentColor": "#0d6efd", "lcdColor": "#e8f7ef", "locked": true } }, { "id": 91, "type": "RichTextEditor", "state": { "pos": { "x": 1053.223724665099, "y": 44.46956649207627 }, "width": 430, "height": 460, "text": "### 从纸带测量，不预设 a\n1. 开始后运行至约 2.0 s，再暂停。\n2. 选中打点计时器，查看“打点数据”。\n3. 每隔 5 个间隔取一个计数点，T = 0.10 s。\n4. 连续取 6 段位移，应用逐差法。\n\na = [(s₄ + s₅ + s₆) − (s₁ + s₂ + s₃)] / (9T²)\n\n蓝色曲线为实时 vₓ–t 图。改变恒力后重置复测。", "imageDataUrl": "", "imageName": "", "imageFit": "contain", "imagePosition": "top", "imageHeight": 92, "backgroundColor": "#ffffff", "backgroundOpacity": 0.96, "textColor": "#163047", "fontSize": 16, "fontWeight": 400, "fontFamily": "sans-serif", "textAlign": "left", "lineHeight": 1.45, "padding": 18, "borderColor": "#cbd5e1", "borderWidth": 1, "cornerRadius": 10, "showBorder": true, "locked": false } }, { "id": 7, "type": "ObservationVariables", "state": { "pos": { "x": 955.1256119185376, "y": 605.6709258607993 }, "width": 420, "height": 252, "title": "小车实时测量", "accentColor": "#0f766e", "fontSize": 13, "compactMode": false, "locked": false, "editIndex": 0, "insertSourceId": "", "insertMode": "", "definitions": [ { "id": "reading_time", "name": "time", "label": "时间 t / s", "expression": "ref_6_time", "visible": true }, { "id": "reading_x", "name": "x", "label": "位移 x / m", "expression": "ref_1_basic_x - 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