# Displacement and rotation

1. May 6, 2007

### kasse

A beam AB has constant EI and u(x) describes the deformation:

The first task here is to show that there's no displacement or rotation at A. For the case of the displacement, I guess I can do that simply by replacing x with 0 in the u(x)-equation?

But how about the rotation? What is meant by that? Is it the same as slope?

Last edited: May 6, 2007
2. May 6, 2007

### Pyrrhus

Yes and yes the first derivative du(x)/dx is the rotation or slope (Remember that for small angles $\tan \theta \approx \theta$)