Simple Harmonic Motion on a moving platform


by chrisy2012
Tags: harmonic, motion, moving, platform, simple
chrisy2012
chrisy2012 is offline
#1
Apr25-12, 03:26 PM
P: 17
I had my physics midterm today and I totally blanked out. I want to know how to solve it for next time.

So In the picture, there are two springs connected to the mass on a platform.
a) if the platform is at rest, find the angular frequency

the expression for angular frequency is :ω=√(k/m), so I just added the two k's and plugged it into k and got :ω=√((k1+k2)/m). Is this correct?

b)The platform then started to move in SHM with the equation d(t)=D*cos10∏t. We had to find the amplitude of mass M. This is where I tripped up and don't know how to solve it. Any ideas?
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tiny-tim
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Apr25-12, 03:33 PM
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hi chrisy2012!
Quote Quote by chrisy2012 View Post
the expression for angular frequency is :ω=√(k/m), so I just added the two k's and plugged it into k and got :ω=√((k1+k2)/m). Is this correct?
maybe!
how would you prove it?
b)The platform then started to move in SHM with the equation d(t)=D*cos10∏t.
find the positions of the two endpoints as functions of t, and that will help you find the distances to multiply by the spring constants


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