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July 28, 2015

Homework Help: Physics

Posted by Jon on Wednesday, January 12, 2011 at 5:02pm.

A block with mass M rests on a frictionless surface and is connected to a horizontal spring of force constant k, the other end of which is attached to a wall. A second block with mass m rests on top of the first block. The coefficient of static friction between the blocks is mu*s. Find the maximum amplitude of oscillation such that the top block will not slip on the bottom block.

I did the exact same question as this only with numbers and got the right answer subbing my numbers into
A=mu(coefficient of static friction*g/w^2

So, i thought the answer would be
A=(mu*g*m)/k
But I was told that the correct answer does not depend on mu (the coefficient of static friction). So I'm guessing it must get cancelled out of the equation? I'm confused because I needed it in the first question when I actually subbed numbers in?

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