Statics Quiz
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FREE-BODY DIAGRAMS AND EQUILIBRIUM
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A particle is subjected to four forces in 3D space. Three of the forces are: F1⃗=20i^+15j^−10k^\vec{F_1} = 20\hat{i} + 15\hat{j} - 10\hat{k} N, F2⃗=−12i^+8j^+25k^\vec{F_2} = -12\hat{i} + 8\hat{j} + 25\hat{k} N, and F3⃗=5i^−20j^+12k^\vec{F_3} = 5\hat{i} - 20\hat{j} + 12\hat{k} N. For equilibrium, what must be the fourth force F4⃗\vec{F_4}?
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