M4 - damped harmonic motion - please...

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theboyberman
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Hi,

When it comes to setting up the differential equation for damped harmonic motion i come up with a few problems.

I can manage to find the resultant force, say from the spring and tension, and i can also cope with the resistance fine.

I then use F=ma however I get mixed up with signs. I only manage because it says (the question) what i need to proove but if it didn't i would get different signs to them. I have tried to see how they (the book) get their differential equation but i can't see it.

Is the a set position you have to consider when setting up the differential equation in order to get the right signs and stuff.

Thanks

Richard
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