The y-components of F_{1} and F_{2} balance each other. Thus, the net force along the y-axis is zero.

The x-components of F_{1} and F_{2} add up.

Using Newton's second law:

ΣF_{x} = - F_{1x} - F_{2x} + F_{3x} = 0

F_{3x} = F_{1x} + F_{2x}

The figure (Figure 1) below shows two of the three forces acting on an object in equilibrium.

Redraw the diagram, showing all three forces. Label the third force *F _{3}*. $\stackrel{\mathbf{\rightharpoonup}}{{\mathbf{F}}_{\mathbf{3}}}$

Draw the force vector with its tail at the dot. The orientation of your vectors will be graded. The exact length of your vectors will not be graded but the relative length of one to the other will be graded.

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