Question

Which of the following statement is NOT true for 'self-weight' (one of the non-applied forces)?
1. When analysing non-equilibrium conditions of a body, self-weight is treated as acting through the centre of gravity of the body.
2. Everybody subjected to gravitational acceleration and hence has got a self-weight.
3. Self-weight always acts in vertically downward direction.
4. If self-weight is very small, it may be neglected.

Answer 1

Correct Answer - Option 1 : When analysing non-equilibrium conditions of a body, self-weight is treated as acting through the centre of gravity of the body.

Concepts:

Self-weight is the load on a structure imposed by its own weight, due to the mass present in it.. Self-weight is directly influenced by the material density of the structure.

Characteristics of self-weight:

1. It always acts in the direction of gravity i.e. vertically downward direction.

2.  It always acts through center of gravity of body irrespective of body is in equilibrium or not.

3.  Self weight is not generally neglected, however it is neglected if it is very small and does not cause any effect in structure.

4. Mathematically, it is calculated as:

             Weight = Unit Weight × Volume of shape

5. It is due to presence of mass inside the body.