Harmonic motion with friction x(t)=

[live4physics]

harmonic motion with friction x(t)=...

Homework Statement

Anybody knows what´s the equation x(t)=... for harmonic motion with friction ?

Homework Equations

For exemple, a string-block sistem with friction ?
I need determine the position of block at t instant.

The Attempt at a Solution

 

[rock.freak667]

Why don't you form the equation of motion just adding friction in the FDB?