Study the diagram of a computer desk. Each member of the structure is under some type of force.

PART A: Is in tension because the weight of the computer is stretching it.

PART B: Is under compression because the weight of the computer unit and the members above that make up the desk, are pushing downwards and compressing it.

PART C and B: This is the same member but on the inside compression is taking place and on the outside it is being stretched (under tension).