Find Frequency of Spring with Mass & Length Connected to Rigid Wall

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The discussion focuses on calculating the frequency of a spring with mass m and length L connected to a rigid wall and a mass M, assuming no damping. The effective mass of the spring is determined to be one-third of its total mass. Key equations include the kinetic energy (KE) of a differential mass element dm, expressed as 1/2 dm * v^2, where the velocity v is proportional to the distance from the fixed end of the spring. The integration of this expression over the length of the spring yields the total kinetic energy, allowing for the calculation of the effective mass and frequency of the oscillating system.

PREREQUISITES
  • Understanding of basic mechanics and oscillatory motion
  • Familiarity with spring dynamics and effective mass concepts
  • Knowledge of calculus for integration of functions
  • Concept of kinetic energy in mechanical systems
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  • Study the derivation of the effective mass of a spring in oscillatory motion
  • Learn about the principles of harmonic oscillators and their frequency calculations
  • Explore the integration techniques for variable mass distributions
  • Investigate the effects of damping on oscillatory systems
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Physics students, mechanical engineers, and anyone interested in the dynamics of oscillating systems and spring mechanics.

NotMrX
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Suppose a spring with mass m and length L is connected to a rigid wall and a mass of M. Assuming no damping how do we find the frequency?

for the spring Density = m/L = D; dm = D dx
I don't know where to go from there.
 
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The effective mass of a spring undergoing oscillatory motion is considered
to be 1/3 the mass of the spring. For any portion of the spring the
KE of dm is 1/2 dm * v^2. For a spring fixed at one end the velocity of an
element dm will be proportional to the distance from the fixed end - so
v = V*(y/Y) where Y is the length of the spring and V is the velocity of the moving end. Also, you can write dm = M * (dy/Y). Using these values
integrate 1/2 v^2 dm over the length of the spring to get the KE of the
oscillating spring and determine the effective mass of the spring.
 
Thanks, I understand now.
 

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