I mean why do you want to have a rigid rod down the middle of your back and segmented muscles down either side?

Hence, the frequency is the same as if the two masses were connected by a rigid rod.

However recent experimental and theoretical studies have called into question this picture of polyproline peptide as a "rigid rod".

Lever, a rigid rod or bar to which a force may be applied to overcome a resistance.

In the case of a rigid and uniform rod I can be expressed as:

She shut her eyes and winced as he forced the massive rigid rod into her.

Single bonds are represented by (fairly) rigid grey rods.

It was just a rigid rod of purple which had struck and stiffened the Creator.

Consider a rigid body of N particles joined by rigid rods.

She could feel the two rigid rods rubbing together inside her.