Chapter 5 Rigid Body Equilibrium [STATICS]

Point O only

Only ONE point

At ANY point on the body

Preventing TRANSLATION, there is FORCE

Preventing TRANSLATION, there is MOMENT

Preventing ROTATION, there is MOMENT

Preventing ROTATION, there is FORCE

Apply EoE -> Draw FBD -> Determine all unknowns

Draw FBD -> Apply EoE -> Determine all unknowns

WRONG solution, RE-DO everything

CORRECT answer, ACCEPT as it stands

CORRECT answer, however, the DIRECTION of that force/moment is REVERSED from the assumed

There is no solution

There are only two forces acting on a member, hence the direction is known, just need to find the magnitude

There are only two forces acting on a member, need to find both direction and magnitude

Concurrent or parallel

Coplanar

YES, different concept altogether

NO difference at all

NO, EXCEPT needs to apply 3D FBD and equilibrium

REDUNDANT constraints: More support than needed for equilbrium

REDUNDANT constraints: Leads to instability

REDUNDANT constraints: Statically indeterminate

IMPROPER constraints: Leads to instability