Equations for Normal Forces at A and B: F_A + F_B = 0d * F_A - b * F_B = 0

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SUMMARY

The discussion focuses on understanding the equations for normal forces at points A and B, specifically the relationship expressed as F_A + F_B = 0 and d/b * F_B = 0. The key takeaway is that the balance of forces and moments is essential for solving for the normal forces acting at these points. By establishing two balance equations, one can solve for the unknowns, F_A and F_B, effectively applying principles of static equilibrium.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with balance equations in mechanics
  • Knowledge of normal forces in physics
  • Basic algebra for solving equations
NEXT STEPS
  • Study the concept of static equilibrium in mechanics
  • Learn how to derive and apply balance equations
  • Explore the role of normal forces in various physical scenarios
  • Practice solving problems involving multiple forces and moments
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and equilibrium, as well as educators looking for examples to illustrate the concepts of normal forces and balance equations.

WesTech
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1. Homework Statement

This isn't really a problem but an example in an online lecture. I'm trying to understand everything for when I get to harder questions but am having trouble understanding the "d/b" part of the equation.

Homework Equations


How does dividing d by b help solve for the normal forces acting at A and B? I apologize if my question is not phrased well enough.

The Attempt at a Solution

 
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Hi Wes,

It's all about balance equations: The thing doesn't move (or keel over, which is also a form of motion), so
  1. the forces balance
  2. the moments balance
If you write down these two balance equations you have two equations for two unknowns (normal force at A and at B).

Do us a favor and write down these two equations and we'll take it from there (if still necessary :smile:)
 

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