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<h2 class="hd hd-2 unit-title">Topics and Reading List</h2>
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<p> As you go through the lesson, you will find this list of reading from the textbook complementary to the videos and exercises, and on many occasions these readings will contain relevant material to the presentation:</p><ul><li> Force Laws: <a href="/courses/course-v1:MITx+8.01.1x+3T2018/pdfbook/0/chapter/8/2"><i class="it">chapter 8, section 1</i></a></li><li> Constraint Forces: <a href="/courses/course-v1:MITx+8.01.1x+3T2018/pdfbook/0/chapter/8/9"><i class="it">chapter 8, section 3</i></a></li><li> Free Body Diagrams: <a href="/courses/course-v1:MITx+8.01.1x+3T2018/pdfbook/0/chapter/8/16"><i class="it">chapter 8, section 4</i></a></li></ul>
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<h2 class="hd hd-2 unit-title">L6v1: Contact Forces</h2>
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<h3 class="hd hd-2">L6v1: Contact Forces</h3>
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<h2 class="hd hd-2 unit-title">L6Q1: Pushing a Block</h2>
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L6Q1: Pushing a Block
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A box of mass [mathjaxinline]m[/mathjaxinline] is being pushed to the right so that it slides along a horizontal surface by a horizontal force of magnitude [mathjaxinline]F[/mathjaxinline], also pointing to the right. The coefficient of kinetic friction between the box and the surface is [mathjaxinline]\mu _ k[/mathjaxinline]. What is the magnitude of the box's acceleration [mathjaxinline]a[/mathjaxinline]? Express your answer in terms of [mathjaxinline]F[/mathjaxinline], [mathjaxinline]m[/mathjaxinline], [mathjaxinline]g[/mathjaxinline] and mu_k for [mathjaxinline]\mu _ k[/mathjaxinline] as needed. </p>
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<p style="display:inline">[mathjaxinline]a=[/mathjaxinline] </p>
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<h2 class="hd hd-2 unit-title">L6v2: Static Friction</h2>
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<h3 class="hd hd-2">L6v2: Static Friction</h3>
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<h2 class="hd hd-2 unit-title">L6Q2: Block on an Incline</h2>
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Block on an incline
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<p>A block is sitting at rest on a \(20^{\circ}\) incline.</p>
<p>Draw a free-body diagram for this block.</p>
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<em>Focus on drawing the correct forces at roughly the correct angles. Angles do not need to be exact, and we are not picky about vector lengths.</em>
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<h2 class="hd hd-2 unit-title">L6Q3: Comparison: Min and Max Force</h2>
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Comparison: Min and Max Force
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<p>You push a block of mass \(m\) against a vertical wall with a force of magnitude \(F\) applied at an angle \(50^{\circ}\) above the horizontal as shown. <strong>There is friction between the wall and the block</strong>.</p>
<p>Consider that there is some minimal value \(F_{\text{min}}\) required to keep the block steady; if you push with less than this force, the block will slide down the wall. Similarly, if you push harder than a certain value \(F_{\text{max}}\), the block will begin to slide up the wall.</p>
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<h2 class="hd hd-2 unit-title">L6Q4: Suspended Block</h2>
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<p>Two blocks, 1 and 2, are pushed along the frictionless surface of a table by a force of magnitude \(F\) applied to block 1. There is friction between the two blocks and the force \(F\) is large enough such that block 2 stays fixed relative to block 1 during the pushing.</p>
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<p>Draw free-body diagrams for block 1 and block 2 as they are pushed across the table. The pushing force \(F\) on block 2 has already been drawn. <em>Be sure that your force vectors start with their tails on the object.</em></p>
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