# Can a shear force diagram be a function of applied load P?

1. Apr 7, 2014

### annas425

…or must it be of displacement, x?

In a shear force, V (or bending moment, M) diagram, isn't it usually the shear force (or bending moment) plotted as a function of displacement, x?

When someone asks to "draw the shear force and bending moment diagrams as a function of the applied load P," I'm assuming that means to put V (or, in the case of moment, M) on the y-axis (dependent variable) and P on the x-axis (independent variable)?

2. Apr 7, 2014

### SteamKing

Staff Emeritus
Shear force and bending moment are plotted along the length of the beam. The shear force is determined by the loads applied to the beam and the location and nature of the beam supports. If the x-coordinate is measured along the length of the beam, then V and M are functions of x.

3. Apr 7, 2014

### annas425

Okay, so "shear force diagram" and "plot of shear force vs. load P" are not synonymous, correct??

4. Apr 8, 2014

### SteamKing

Staff Emeritus
I don't know what the phrase "plot of shear force vs. load P" even means. If you double the load P, then you'll double all of the shear forces in the beam.