True or false
1,A frictionless surface can only exert a force perpendicular to the surface.
2,A rod connected to a smooth pin or hinge can exert a force that is not parallel to the rod.
3,In a typical free-body diagram, it is not necessary to draw the couple moments that act on the body.
4,For a two-force member to be in equilibrium, the couple moment must be zero.
5,A single smooth pin connected to a body can exert a moment on the body parallel to the pin.
6,If a body is subjected to more unknown reactions than available equations of equilibrium, then the problem cannot be solved completetly.
7.Couple moments must be placed at a specific point on a free-body diagram.
