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    "<div style=\"border:1px solid black; padding:10px 10px;\">\n",
    "    <strong>Jupyter Notebooks for Teaching and Learning - Journée du digital HEI, February 10, 2020</strong><br/>\n",
    "    C. Hardebolle, CC BY-NC-SA 4.0 Int.<br/><br/>\n",
    "    <span style=\"text-decoration:underline;font-weight:bold;\">How to use this notebook?</span><br/>\n",
    "    This notebook is made of text cells and code cells. The code cells have to be <strong>executed</strong> to see the result of the program. To execute a cell, simply select it and click on the \"play\" button (<span style=\"font: bold 12px/30px Arial, serif;\">&#9658;</span>) in the tool bar just above the notebook, or type <code>shift + enter</code>. It is important to execute the code cells in their order of appearance in the notebook.\n",
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    "# Demonstration with the virtual lab\n",
    "\n",
    "The \"Suspended object\" virtual lab below allows to **experiment with different counterweights** to see how it affects the position of the jeans suspended on the cable.   \n",
    "\n",
    "<span style=\"font-weight:bold;text-decoration:underline;\">Step 1 \\[Predict\\]:</span> Ask students to predict which counterweight allows to suspend the wet jeans (clicker question)."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<span style=\"font-weight:bold;text-decoration:underline;\">Step 2 \\[Observe\\]:</span> Execute the code cell below (click on it then click on the \"play\" button in the tool bar above) to **launch the virtual lab**.  \n",
    "\n",
    "Ask participants **which value(s) for the counterweight they would be interested to try out** (based on their answer to the clicker question).  \n",
    "Then test the values suggested by participants and ask them to **observe**:  \n",
    "* the position of the cable \n",
    "* the angle that the cable makes with the horizon \n",
    "* the **forces** that apply on the object (and how they evolve)\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": [
    "from lib.suspendedobjects import *\n",
    "SuspendedObjectsLab(demo_mode = True);"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "*If you wonder how the virtual lab works, you can have a look at the code in [this python file](lib/suspendedobjects.py).*\n",
    "\n",
    "<br/>\n",
    "\n",
    "<span style=\"font-weight:bold;text-decoration:underline;\">Step 3 \\[Explain\\]:</span>\n",
    "\n",
    "Highlight:  \n",
    "* how vectors sum graphically\n",
    "* how forces compensate for static equilibrium  \n",
    "* how the angle influences the vertical and horizontal components of the two tensions\n",
    "\n",
    "Use two specific values to illustrate the differences:\n",
    "1. With a counterweight of 6 kg.\n",
    "2. With a counterweight of 12kg\n",
    "\n",
    "\n",
    "<span style=\"font-weight:bold;text-decoration:underline;\">Step 4 \\[Check\\]:</span> Ask the suspended jeans question again and then the second clicker question for checking understanding (clicker questions).\n",
    "\n",
    "\n",
    "<br/>\n",
    "\n",
    "# Resources\n",
    "\n",
    "This demonstration implements partly the **Predict-Observe-Explain** pattern:  \n",
    "White, R. T., & Gunstone, R. F. (1992). Probing Understanding. Great Britain: Falmer Press.  \n",
    "https://arbs.nzcer.org.nz/predict-observe-explain-poe\n"
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