![]() ![]() When is a system of collinear forces in equilibrium? When a body is subjected to a system of forces such that the resultant of all forces and the resultant moment are zero, then the body is in equilibrium. What are the conditions for a system of forces to be in equilibrium? ![]() ∑M8= 0 The first states that the algebraic sum of the forces is zero and the second that the algebraic sum of the moments about any point (not on the line of action) is zero (0). What are the conditions for a system of concurrent forces to be in equilibrium?Įquilibrium conditions for concurrent forces. Example of concurrent and coplanar forces. ![]() Parallel forces: All those that have the same direction (although they may have different meanings) than a certain unit vector. To make the cards coplanar, you would have to lay them all out on a table with no overlaps.Coplanar forces: Those that are contained in the same plane. So in the deck we have 52 separate (but parallel) planes with one card in each plane. In the deck of cards on the right none of the cards are coplanar.Įach card is in a plane of its own, and although those planes are parallel to each other, that does not count as being in the same plane. * Each time you uncheck the box a different set of random points is produced. You can think of the green surface as a plane, and because the two cards are on that plane they are coplanar. In the image above, the two cards are both laying on a green surface. Imagine some playing cards laying side by side on a tabletop, they are coplanar,īecause they both are in the same plane as each other. It's not just points that can be coplanar. If you uncheck the 'coplanar' checkbox, the points are then randomly spread out in space and are therefore not coplanar*. They are coplanar because they all lie in the same plane as indicated by the yellow area. ![]() In the applet above, there are 16 coplanar points. Two objects are coplanar if they both lie in the same plane. ![]()
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