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**1. Homework Statement**

Two blocks (m=1Kg, M=10Kg) and a spring (k=200N/m) are arranged on a horizontal frictionless surface. The coefficient of static friction between the two blocks is 0.40 (the small block sits atop the large block). What amplitude of simple harmonic motion of the spring-blocks system puts the smaller block on the verge of slipping over the large block?

**2. Homework Equations**

I can calculate angular frequency using [tex]w=\sqrt{k/m}[/tex]...not sure if this is helpful..and [tex]E=1/2kx_m^2[/tex]

**3. The Attempt at a Solution**

The block will slip off when the acceleration of the system is a maximum, this happens at [tex]+/- x_m[/tex]..im not sure how to rlate the friction into the equation, help getting started would be appreciated.

Thanks