Two force component refers to a component that has only two points of force and is in balance.
Features of two force components:
Both ends of the member are hinged, and the direction of the restraint reaction force is uncertain;
In addition to the binding force, it is not subject to any other external force, and the gravity is not considered;
The necessary and sufficient conditions for the two forces acting on the rigid body to balance the rigid body are: the size of the two forces is equal, the direction is opposite, and the line of action is along the same straight line. This axiom reveals the simplest equilibrium condition of force system.
Difference between two force members and two force members:
Two force bar: refers to a bar that is only stressed at both ends and is in balance.
Two force members can only accept two forces, but two force members are not limited to two forces, as long as they act on both ends of the member.