Which of the following statements must be true of a twoforce

Which of the following statements must be true of a two-force member in static equilibrium? 5 I. Forces must be equal in magnitude. II. Forces must have collinear lines of action. IIL. Forces must produce the same moment about every point in a plane IV. Forces must be of opposite sense. O (A) 1, 1I, and IV only (B) 1 and IV only O (C) 1,11,111, and IV (D) I. III, and IV only

Solution

Option A is correct. The forces has to be of equal magnitude, should be collinear, should have same moment in magnitube but opposite direction and must be of opposite sense.