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## Homework Statement

http://fatcat.ftj.agh.edu.pl/~i7zebrow/rysunek.jpg

tring constant is k,

object mass is [tex]M_{1}[/tex]

Damping friction is b

and we wiggle the top end of spring in the above diagram with amount Asin(wt)

(Where A is a amplitude and w is a frequency).

## Homework Equations

Spring Force:

[tex]Fs=-kx[/tex]

Damping force is:

[tex]Fb=-b\frac{dx}{dt}[/tex]

## The Attempt at a Solution

I don't need full solution.I just looking for differential equation for this problem.My attempt is:

[tex]M_{1}\frac{d^{2}x}{dt^{2}}+b\frac{dx}{dt}+kx=Asin(\omega t)[/tex]

I am sure about left side of the eguation but the right side is propably wrong I hope that someone can tell me where I made an mistake.

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