Noncoplanar is a term in geometry referring two or more figures, lines, or points that do not all lie in the same plane.
skew
Noncoplanar points are points that do not lie on the same plane. If you have two rectangles joined together at points CD, then the rectangle at points ABCD have coplanar points but the points EF are not coplanar, that is, they do not lie on the plane defined by ABCD. On the other hand, the points CDEF are coplanar points but points AB are noncoplanar points. Dr Grips
Skew lines are noncoplanar; therefore they're not parallel & don't intersect.
concurrent lines are In geometry, three or more lines are said to be concurrent if they intersect at a single point.
Concurrent forces are forces that share a common point of intersection, causing them to act through a single point. Non-concurrent forces do not share a common point of intersection and their lines of action do not meet at a single point.
Concurrent forces are forces that act on a single point but have different lines of action. The resultant of concurrent forces is found by resolving the forces into components and adding them vectorially.
Non concurrent forces are those forces that do not have a common point of intersection and act along different lines of action.
Concurrent coplanar forces have their lines of action intersecting at a common point, allowing them to be resolved using the parallelogram law of forces. Non-concurrent coplanar forces have their lines of action not intersecting at a common point, requiring the use of the triangle law of forces for resolution.
how two forces are added if they are not concurrent but are acting in same direction
Concurrent forces are forces that all act on a single point but have different lines of action. These forces can be resolved into components that act in different directions. The equilibrium of a body under concurrent forces can be analyzed using vector diagrams.
When all the forces of a force system act in one plane it is called coplanar force system. If the forces act in more than one plane then it is forces in space. In this case forces are not contained in one plane. When all the forces of a system pass through a common point they are called concurrent forces. Thus we have concurrent coplanar forces when all forces are in one plane and pass through a common point. Also when forces in space pass through a common point we have concurrent forces in space.
Non concurrent forces are those forces that do not have a common point of intersection and act along different lines of action.
Force systems can be classified as concurrent, parallel, or non-concurrent. Concurrent force systems have all forces intersecting at a common point. Parallel force systems have forces acting in the same direction. Non-concurrent force systems have forces that do not meet at a common point.
Collinear forces are concurrent system type of forces, whereas parallel vector forces cannot be concurrent system type of force but they can be coplanar nonconcurrent system type of force
The magnitude of the resultant force in the case of the concurrent forces in equilibrium.
Forces that do not have a common point of intersection.