Need help with finding forces in a truss

[SueC]

Homework Statement

http://itsyourpc.org/sue/files/statics.jpeg

Homework Equations

please show me the equations.

The Attempt at a Solution

I am having a very hard time with this.

 

[PhanthomJay]

Hi, Sue, welcome to PF!

You must show some attempt at your work before we can be of much assistance. These are the PF rules. You might want to first determine the end reactions at A and C by first summing moments about C.

 

[Mene]

I understand the importance of being able to find forces in a truss. Trusses are structures that are commonly used in engineering and architecture, and understanding the forces acting on them is crucial for their stability and safety. In order to find these forces, we can use the method of joints or the method of sections.

The method of joints involves analyzing the forces at each joint in the truss. This can be done by drawing a free body diagram of each joint and applying the equations of static equilibrium, which state that the sum of all forces acting on a body must be equal to zero and the sum of all torques acting on a body must also be equal to zero. By solving these equations simultaneously, we can determine the forces at each joint.

The method of sections involves cutting the truss into smaller sections and analyzing the forces acting on each section. This method is particularly useful for more complex truss structures. By applying the same equations of static equilibrium, we can determine the forces in each section and then use this information to find the forces at each joint.

In order to fully understand and apply these methods, it is important to have a good understanding of vectors and vector operations, such as addition and subtraction. It is also helpful to have a strong understanding of basic trigonometry, as many of the forces in a truss are represented by angles and lengths.

In conclusion, finding forces in a truss is a fundamental skill in engineering and can be achieved by using the methods of joints or sections. It is important to have a good understanding of vectors and trigonometry in order to successfully solve these problems. If you need further assistance with your homework, I suggest seeking help from your teacher or a tutor who can guide you through the process and provide you with the necessary equations.