Updating bungee.ipynb

AllenDowney · AllenDowney · commit eb5679dbe931 · 2017-11-01T16:42:17.000-04:00
diff --git a/code/bungee.ipynb b/code/bungee.ipynb
@@ -779,8 +779,8 @@
    "outputs": [],
    "source": [
     "def spring_force(y, y_attach, length, k):\n",
-    "    zero_point = y_attach - length\n",
-    "    offset = y - zero_point\n",
+    "    neutral_point = y_attach - length\n",
+    "    offset = y - neutral_point\n",
     "    f_spring = -k * offset\n",
     "    return f_spring"
    ]
@@ -809,7 +809,6 @@
     "    f_drag = -np.sign(v) * rho * v**2 * C_d * area / 2\n",
     "    a_drag = f_drag / mass\n",
     "    \n",
-    "    drop = init.y - y\n",
     "    f_spring = spring_force(y, y_attach, length, k)\n",
     "    a_spring = f_spring / mass\n",
     "    \n",
@@ -860,7 +859,9 @@
   {
    "cell_type": "code",
    "execution_count": 23,
-   "metadata": {},
+   "metadata": {
+    "collapsed": true
+   },
    "outputs": [],
    "source": [
     "run_odeint(system2, slope_func)"
