The document discusses coplanar and concurrent systems of forces, focusing on Lami's theorem and its applications. It explains the conditions for equilibrium among three coplanar forces and provides examples involving tensions in strings and weights. For further details, a link to additional resources is provided.

2.  Introduction
 Coplanar Concurrent System of Forces
 Lami’s Theorem
 Examples

3.  Coplanar and non-coplanar forces
 Collinear and non-collinear forces
 Concurrent and non-concurrent forces
 Parallel and non-parallel forces

4.  Coplanar System - The line of action of all the forces lie on a single
plane.
 Concurrent System - The line of action of all the forces intersect at a
common point.

5. If three coplanar forces simultaneously acting at a point are in equilibrium
then each force is proportional to the sine angle of the other two forces.
Consider the forces A, B and C as shown in figure.

6. Determine the tension in the strings that support a lamp fixture as shown
in figure.

7. Determine A string ABCDE whose one end A is fixed to the wall and the
other end E is loaded with a weight of 300N. The string passes through a
frictionless pulley and other two weights are hung at B and C as shown in
figure. Determine the tension in the string and the magnitude of weights
W1 and W2.

8. This was just a summary on Lamis Theorem. For more detailed information
on this topic, please type the link given below or copy it from the
description of this PPT and open it in a new browser window.
www.transtutors.com/homework-help/mechanical-engineering/force-systems-
and-analysis/lamis-theorem-solved-examples.aspx