Style is something that causes deformation of the structure. Style has magnitude and direction, depicted in the form of a vector whose direction is indicated with arrows children, while the length of the vector used to indicate the amount. The style is a quantity that tend to encourage / changing the shape of the object that is imposed in the direction of the work force. As a vector, style has three characteristics, namely the magnitude, direction and point / location operation that usually represented the line of the arrow as shown in the figure below.
Point application can be represented by the base or tip / head of arrows.
Figure 2.2 Style as a vector
It means that if one or more of three characteristics is changed, then the effect of the object subjected to this style will change as well. The magnitude of the effect is clear style. For example, if we tried to push the relatively large car alone, chances are the car does not move because of the style that we give to the car is not big enough. But if we ask for help two other people to help push the car, it is possible that the car can be driven by three individuals due to the force created by the three men is greater than the force generated by a single person.
Direction of force clearly had an effect on objects that are subject to these styles as seen in the image below in which a force is applied to a crate in two different directions, horizontally and vertically. Although these two forces have great and the point of application are the same, but the reaction of the crate against horizontal forces will be different when compared to the reaction to the vertical force.
Figure 2.3 Direction of force had an effect on objects
While the point of application can be described as follows where a simple bridge which is supported by a pedestal left and right pedestal. If the force exerted its position close to the pedestal to the left (style represented by the solid line) then we can feel that the foundation of the Left will receive a larger force than the pedestal that right. Conversely, if the forces acting close to the pedestal right (style represented by the dotted line), the foundation of the right which will receive a larger force.
Here we can see how to change the point of application of force to change the reactions that occur on the system structure.
Figure 2.4 Point style affect the reaction
Mechanics in Engineering, discussed only the style that is located in one plane (coplanar). In the science of structural analysis, the style is divided into 3 (three), are as follows:
1. Style coplanar is when the forces working in the line of work that one plane.
2. Concurrent Style is when the forces that work intersect at a point.
3. Style Kolinier is when the forces have a working line in a straight line.