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| 183_notes:static_eq [2021/05/08 19:00] – [Why torque matters] stumptyl | 183_notes:static_eq [2021/11/15 17:25] (current) – [Lecture Video] pwirving |
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| While you are beginning to learn about [[183_notes:torque|how objects rotate]], it's worth taking an aside to discuss how objects remain still. You have already begun this work, when you read about [[183_notes:freebodydiagrams|Free Body Diagrams]] and worked with [[183_notes:youngs_modulus|Young's Modulus]]. In both those cases, you read that an object at rest will remain at rest ([[183_notes:momentum_principle|it won't change its momentum]]) as long as the net force acting on the object is zero. It turns out that isn't the complete story. **In these notes, you will read about static equilibrium, how the concept of torque plays a key role in defining static equilibrium, and how we analyze static equilibrium situations.** | While you are beginning to learn about [[183_notes:torque|how objects rotate]], it's worth taking an aside to discuss how objects remain still. You have already begun this work, when you read about [[183_notes:freebodydiagrams|Free Body Diagrams]] and worked with [[183_notes:youngs_modulus|Young's Modulus]]. In both those cases, you read that an object at rest will remain at rest ([[183_notes:momentum_principle|it won't change its momentum]]) as long as the net force acting on the object is zero. It turns out that isn't the complete story. **In these notes, you will read about static equilibrium, how the concept of torque plays a key role in defining static equilibrium, and how we analyze static equilibrium situations.** |
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| ==== Lecture Video ===== | |
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| {{youtube>RzA8uywxjzc?large}} | |
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| ===== Defining Static Equilibrium ===== | ===== Defining Static Equilibrium ===== |
| $$\sum F_x = 0 \qquad \sum F_y = 0$$ | $$\sum F_x = 0 \qquad \sum F_y = 0$$ |
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| If the sum of all the forces is zero then static equilibrium is possible but **not** guaranteed. | //If the sum of all the forces is zero then static equilibrium is possible but **not** guaranteed.// |
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| [{{ 183_notes:statics_bar.png?250|A bar with two identically sized forces acting on it.}}] | [{{ 183_notes:week12_staticpivotforces.png?350|A bar with two identically sized forces acting on it.}}] |
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| ==== Why Torque Matters ==== | ==== Why Torque Matters ==== |