Introduction Coplanar Concurrent Systemof Forces Lamis Theorem Examples

� Introduction � Coplanar Concurrent Systemof Forces � Lami’s Theorem � Examples

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

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

If three coplanar forces simultaneously acting at apoint are in equilibrium then each force is proportional to the sine angle of the other two forces. Consider the forces A, Band Casshown in figure.

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

Determine A string ABCDE whose one end A is fixed to the wall and the other end E is loaded with a weight of 300 N. 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 W 1 and W 2.

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