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      <title>Free Falling in Outer space  by ltoader03</title>
      <link>https://padlet.com/ltoader03/siena</link>
      <description>Putting objects into orbit is very expensive because not only you have to raise the object into the air, but you typically have to lift up most of the fuel you plan to use as well.

</description>
      <language>en-us</language>
      <pubDate>2015-05-09 02:21:22 UTC</pubDate>
      <lastBuildDate>2023-11-02 20:08:06 UTC</lastBuildDate>
      <webMaster>hello@padlet.com</webMaster>
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         <url>https://padlet-assets.storage.googleapis.com/portrait/earth.jpg</url>
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      <item>
         <title>Let&#39;s Begin</title>
         <author>ltoader03</author>
         <link>https://padlet.com/ltoader03/siena/wish/59905153</link>
         <description><![CDATA[<p><h4>If you were to orbit the Earth, you’d experience the feeling of free fall, not unlike what your stomach feels before a big dive on a roller coaster. With a little help from Sir Isaac Newton, Matt J. Carlson explains the basic forces acting on an astronaut and why you probably shouldn't try this one at home.</h4>&nbsp;]]></description>
         <enclosure url="https://www.youtube.com/watch?t=101&amp;v=tAUXIEr-VzM" />
         <pubDate>2015-05-09 11:32:10 UTC</pubDate>
         <guid>https://padlet.com/ltoader03/siena/wish/59905153</guid>
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      <item>
         <title>Think ...</title>
         <author>ltoader03</author>
         <link>https://padlet.com/ltoader03/siena/wish/59905229</link>
         <description><![CDATA[<p>If an astronaut orbiting the Earth lets go of a rock, what will happen to the rock? Describe the path of the rock and why it follows that path.</p><p>Post your group's video response below.</p>]]></description>
         <enclosure url="" />
         <pubDate>2015-05-09 11:36:39 UTC</pubDate>
         <guid>https://padlet.com/ltoader03/siena/wish/59905229</guid>
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      <item>
         <title>Your Task</title>
         <author>ltoader03</author>
         <link>https://padlet.com/ltoader03/siena/wish/59905312</link>
         <description><![CDATA[<p style="font-weight:bold;"><b><br></b></p><p>Brainstorm ideas on ways<br>you could make constructing a space station more economical.</p><p>Post your group's video on this canvas. In your post, include the document that explains the details of your project&nbsp;.</p>]]></description>
         <enclosure url="" />
         <pubDate>2015-05-09 11:40:30 UTC</pubDate>
         <guid>https://padlet.com/ltoader03/siena/wish/59905312</guid>
      </item>
      <item>
         <title>Additional Resources</title>
         <author>ltoader03</author>
         <link>https://padlet.com/ltoader03/siena/wish/59905684</link>
         <description><![CDATA[<div>1. Dr.Carlson’s <a href="http://www.youtube.com/ScienceTheater">library of science videos</a> includes his more <a href="http://www.youtube.com/watch?v=3R2CplpEMDQ">detailed discussion of Free Fall</a>.</div><div>2. NASA has a number of good web pages on satellites and their orbits including <a href="http://earthobservatory.nasa.gov/Features/OrbitsCatalog/">this one on types of orbits</a>.</div><div>3. There are many physics websites that <a href="http://www.physicsclassroom.com/mmedia/vectors/sat.cfm">describe the motion of satellites</a>.</div><div>4. A few java applications where you can attempt to make a satellite orbit correctly:</div><ul><li>&nbsp;<a href="http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=398">http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=398</a></li><li><a href="https://www.physicsclassroom.com/Physics-Interactives/Circular-and-Satellite-Motion/Orbital-Motion/Orbital-Motion-Interactive">https://www.physicsclassroom.com/Physics-Interactives/Circular-and-Satellite-Motion/Orbital-Motion/Orbital-Motion-Interactive</a></li><li>&nbsp;https://ssd.jpl.nasa.gov/tools/orbit_diagram.html</li></ul><div>4. <a href="https://angry-birds-space.en.uptodown.com/windows">The Angry Birds Spacegame</a> can be used to demonstrate some orbits. Launch a bird slowly and it falls inwards, too hard and it flies out of<br>orbit. Launch it just right and it goes around and around awhile.</div>]]></description>
         <enclosure url="" />
         <pubDate>2015-05-09 12:07:21 UTC</pubDate>
         <guid>https://padlet.com/ltoader03/siena/wish/59905684</guid>
      </item>
      <item>
         <title>Source:</title>
         <author>ltoader03</author>
         <link>https://padlet.com/ltoader03/siena/wish/59905791</link>
         <description><![CDATA[<p>This lesson was adapted from : <a href="http://ed.ted.com/">http://ed.ted.com/</a></p>]]></description>
         <enclosure url="" />
         <pubDate>2015-05-09 12:13:39 UTC</pubDate>
         <guid>https://padlet.com/ltoader03/siena/wish/59905791</guid>
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