Merge pull request #815 from nature-of-code/notion-update-docs

[Notion] Update docs

content/03_oscillation.html

@@ -963,13 +963,13 @@ <h2 id="the-pendulum">The Pendulum</h2>
     this.angle += this.angleVelocity;
   }</pre>
 </div>
+<p>Note that the acceleration calculation now includes a multiplication by –1. When the pendulum is to the right of its resting position, the angle is positive, and so the sine of the angle is also positive. However, gravity should pull the bob back toward the resting position. Conversely, when the pendulum is to the left of its resting position, the angle is negative, and so its sine is negative too. In this case, the pulling force should be positive. Multiplying by –1 is necessary in both scenarios.</p>
 <div class="half-width-right">
   <figure>
     <img src="images/03_oscillation/03_oscillation_19.png" alt="Figure 3.22: The bob position relative to the pivot in polar and Cartesian coordinates">
     <figcaption>Figure 3.22: The bob position relative to the pivot in polar and Cartesian coordinates</figcaption>
   </figure>
 </div>
-<p>Note that the acceleration calculation now includes a multiplication by –1. When the pendulum is to the right of its resting position, the angle is positive, and so the sine of the angle is also positive. However, gravity should pull the bob back toward the resting position. Conversely, when the pendulum is to the left of its resting position, the angle is negative, and so its sine is negative too. In this case, the pulling force should be positive. Multiplying by –1 is necessary in both scenarios.</p>
 <p>Next, I need a <code>show()</code> method to draw the pendulum on the canvas. But where exactly should I draw it? How do I calculate the x- and y-coordinates (Cartesian!) for both the pendulum’s pivot point (let’s call it <code>pivot</code>) and bob position (let’s call it <code>bob</code>)? This may be getting a little tiresome, but the answer, yet again, is trigonometry, as shown in Figure 3.22.</p>
 <p>First, I’ll need to add a <code>this.pivot</code> property to the constructor to specify where to draw the pendulum on the canvas:</p>
 <pre class="codesplit" data-code-language="javascript">this.pivot = createVector(100, 10);</pre>