Equilibrium of two forces

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4 Terms

1
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Resultant force
is a virtual force whose action is equal to the combination of all the forces applied simultaneously to an object.
2
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The resultant force is calculated depending on:
When two forces are applied in __the same direction__, along the same line of action (vertically or horizontally), __the resultant force is the sum of the two__ (Figure 3.21).

When two forces are applied along the same line of action but in __opposite directions__, __the resultant force is the difference between the two__ (Figures 3.22 and 3.23).
When two forces are applied in __the same direction__, along the same line of action (vertically or horizontally), __the resultant force is the sum of the two__ (Figure 3.21). When two forces are applied along the same line of action but in __opposite directions__, __the resultant force is the difference between the two__ (Figures 3.22 and 3.23).
3
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Equilibrium of two forces…
is achieved when the resultant force is zero. The motion of the object therefore remains constant.
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What is a resultant force?
It is very common for an object to be subjected to several forces at the same time. To determine the combined effect of a number of forces acting simultaneously on an object, we calculate the resultant force, or net force.