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Update virtual_work.astro
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kelliehalloran authored Nov 20, 2024
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6 changes: 3 additions & 3 deletions src/pages/sta/virtual_work.astro
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Expand Up @@ -29,7 +29,7 @@ import Col from "../../components/Col.astro"

<!-- Lectures 34 and 35 -->

In general, a force does work when it produces a displacement along its line of action. When we talk about virtual work, we're making those displacements infinitesimally small.
<p>In general, a force does work when it produces a displacement along its line of action. When we talk about virtual work, we're making those displacements infinitesimally small. </p>

<Image src='/Statics/VWorkFigures/VirtualWork.png' width='3.5'></Image>

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<Item>Solve.</Item>
</Enumerate>

We can use virtual work to solve for the forces in a system without needing to solve for all of the support reactions.

<p>We can use virtual work to solve for the forces in a system without needing to solve for all of the support reactions.
</p>
<p>
For example, if a truss is completely pinned on one end, it doesn't move, which means there is no virtual work completed on that pin because there are no virtual displacements ((<InlineEquation equation='dr = 0' />). This means that we can ignore it in our virtual work equation and don't need to solve for the reaction forces at the truss pin.
</p>
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