You are viewing this question as it will appear in the manual grading interface. Return to the normal view when you are done.

Demo: Drawing a lifting mechanism

a) Draw the corresponding free body diagram (disregard friction):

(The expected tolerance is 1/2 square grid for position and 10 degrees for angle.)



Correct answer

Student view placeholder

In student views this area is used for assessment and score info.
Tools

Staff information

Question

Title:
Demo: Drawing a lifting mechanism

Variant

Started at:
2026-09-19 08:00:25 (CDT)
Duration:
0s
Show/Hide answer
{
  "box": [
    {
      "id": 0,
      "x1": 100,
      "x2": 260,
      "x3": 260,
      "x4": 420,
      "y1": 140,
      "y2": 140,
      "y3": 240,
      "y4": 140,
      "type": "pl-4pointrod",
      "color": "#ffffff",
      "graded": false,
      "height": 20,
      "label1": "A",
      "label2": "C",
      "label3": "B",
      "label4": "D",
      "stroke": "#000000",
      "drawPin": true,
      "evented": false,
      "offsetx1": 0,
      "offsetx2": 0,
      "offsetx3": 0,
      "offsetx4": 0,
      "offsety1": -20,
      "offsety2": -20,
      "offsety3": -20,
      "offsety4": -20,
      "selectable": false,
      "gradingName": "pl-4pointrod",
      "strokeWidth": 2
    },
    {
      "id": 1,
      "x1": 33.220133559599326,
      "x2": 345.8598282805151,
      "y1": 133.64001271996185,
      "y2": 329.0398219205342,
      "type": "pl-line",
      "graded": false,
      "stroke": "#008c31",
      "evented": false,
      "opacity": 1,
      "originX": "center",
      "originY": "center",
      "selectable": false,
      "gradingName": "pl-line",
      "strokeWidth": 1,
      "strokeDashArray": [
        4,
        4
      ]
    },
    {
      "id": 2,
      "x1": 100,
      "y1": 140,
      "top": 140,
      "left": 100,
      "type": "pl-vector",
      "angle": 212.0053832080835,
      "label": "",
      "width": 60,
      "graded": true,
      "stroke": "#c72c1c",
      "evented": false,
      "offsetx": 2,
      "offsety": 2,
      "originY": "center",
      "selectable": false,
      "gradingName": "pl-vector",
      "strokeWidth": 3,
      "trueHandles": [
        "mtr"
      ],
      "drawEndArrow": true,
      "drawErrorBox": true,
      "widthErrorBox": 80,
      "drawStartArrow": false,
      "heightErrorBox": 20,
      "offset_forward": 0,
      "XcenterErrorBox": 125.43994912015265,
      "YcenterErrorBox": 155.89996820009537,
      "disregard_sense": false,
      "offset_backward": 60,
      "optional_grading": false,
      "objectDrawErrorBox": null,
      "arrowheadWidthRatio": 1,
      "arrowheadOffsetRatio": 1
    },
    {
      "id": 3,
      "x1": 357,
      "y1": 110,
      "top": 110,
      "left": 357,
      "type": "pl-vector",
      "angle": 90,
      "label": "",
      "width": 60,
      "graded": true,
      "stroke": "#c72c1c",
      "evented": false,
      "offsetx": 2,
      "offsety": 2,
      "originY": "center",
      "selectable": false,
      "gradingName": "pl-vector",
      "strokeWidth": 3,
      "trueHandles": [
        "mtr"
      ],
      "drawEndArrow": true,
      "drawErrorBox": true,
      "widthErrorBox": 120,
      "drawStartArrow": false,
      "heightErrorBox": 20,
      "offset_forward": 40,
      "XcenterErrorBox": 357,
      "YcenterErrorBox": 100,
      "disregard_sense": false,
      "offset_backward": 60,
      "optional_grading": false,
      "objectDrawErrorBox": null,
      "arrowheadWidthRatio": 1,
      "arrowheadOffsetRatio": 1
    },
    {
      "id": 4,
      "x1": 100,
      "y1": 140,
      "top": 140,
      "left": 100,
      "type": "pl-vector",
      "angle": -57.994616791916506,
      "label": "",
      "width": 60,
      "graded": true,
      "stroke": "#c72c1c",
      "evented": false,
      "offsetx": 2,
      "offsety": 2,
      "originY": "center",
      "selectable": false,
      "gradingName": "pl-vector",
      "strokeWidth": 3,
      "trueHandles": [
        "mtr"
      ],
      "drawEndArrow": true,
      "drawErrorBox": true,
      "widthErrorBox": 80,
      "drawStartArrow": false,
      "heightErrorBox": 20,
      "offset_forward": 0,
      "XcenterErrorBox": 84.1000317999046,
      "YcenterErrorBox": 165.43994912015265,
      "disregard_sense": false,
      "offset_backward": 60,
      "optional_grading": false,
      "objectDrawErrorBox": null,
      "arrowheadWidthRatio": 1,
      "arrowheadOffsetRatio": 1
    },
    {
      "id": 5,
      "x1": 260,
      "y1": 240,
      "top": 240,
      "left": 260,
      "type": "pl-vector",
      "angle": -57.994616791916506,
      "label": "",
      "width": 60,
      "graded": true,
      "stroke": "#c72c1c",
      "evented": false,
      "offsetx": 2,
      "offsety": 2,
      "originY": "center",
      "selectable": false,
      "gradingName": "pl-vector",
      "strokeWidth": 3,
      "trueHandles": [
        "mtr"
      ],
      "drawEndArrow": true,
      "drawErrorBox": true,
      "widthErrorBox": 80,
      "drawStartArrow": false,
      "heightErrorBox": 20,
      "offset_forward": 0,
      "XcenterErrorBox": 244.1000317999046,
      "YcenterErrorBox": 265.4399491201526,
      "disregard_sense": false,
      "offset_backward": 60,
      "optional_grading": false,
      "objectDrawErrorBox": null,
      "arrowheadWidthRatio": 1,
      "arrowheadOffsetRatio": 1
    }
  ]
}
History
dec frac
rad deg