67–72 - Equilibrium of Forces The forces F,, F,. . .., F, acting at the same point P are said to be in equilibrium if the resultant force is zero, that is, if F, + F, + ...+ F, = 0. Find (a) the resultant forces acting at P, and (b) the additional force required (if any) for the forces to be in equilibrium. 67. F, = (2, 5), F; = (3, -8) 68. F, = (3, –7), F2 = (4, -2), F; = (-7,9) 69. F, = 4i – j, F; = 3i – 7j, F; = -8i + 3j. F, = i +j 70. F, = i - j. F, = i + j, F; = -2i + j 71. y F, 10, 8 60° 30° 20° F, 72. 4 2+ 3

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