In the screw collinear forces act, what is a collinear system of forces?
(a) The force system having all the forces parallel to each other
(b) The force system having all the forces perpendicular to each other
(c) The force system having all the forces emerging from a single point
(d) Forces cannot form a collinear system of forces, it is not possible
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I need to ask this question from Frictional Forces on Screws topic in portion Friction of Engineering Mechanics