Driving force in simple harmonic oscillator with exponential

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SUMMARY

The discussion focuses on solving a non-homogeneous second-order differential equation for a particle in simple harmonic motion (SHM) subjected to a driving force defined as F(t) = ma * e^(-jt). The initial conditions of the particle are zero position and speed. The participant identifies the need to incorporate both the elastic force and the driving force into Newton's second law, leading to the equation -Kx + F(t) = ma. The solution involves recognizing that the system will oscillate at the frequency of the driving force.

PREREQUISITES
  • Understanding of simple harmonic motion (SHM)
  • Familiarity with differential equations
  • Knowledge of Newton's laws of motion
  • Basic concepts of oscillatory motion and driving forces
NEXT STEPS
  • Study the method of undetermined coefficients for solving non-homogeneous differential equations
  • Learn about the effects of damping in oscillatory systems
  • Explore the concept of resonance in driven harmonic oscillators
  • Investigate the use of Laplace transforms in solving differential equations
USEFUL FOR

Students studying physics, particularly those focusing on mechanics and oscillatory motion, as well as educators seeking to explain the dynamics of driven systems in SHM.

nacreousnereid
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Homework Statement


A particle in SHM is subject to a driving force F(t)= ma*e^(-jt). Initial position and speed equal 0. Find x(t).

Homework Equations


F = -kxdx = mvdv
F(t) = F(0)*e^(iωt)
x(t) = Acos (ωt +φ)

The Attempt at a Solution


I have no idea how to deal with the exponential term. I know I can put the t in e^(-jt) in terms of v, but that makes integration awfully messy. Any tips? Thanks!
 
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There are two forces here: the elastic force and the driving force. When you write Newton's second law you need to include both.
-Kx+F(t)=ma

This will result in a non-homogeneous second order differential equation.
A possible solution will be an oscillation with the same frequency as the driving force's frequency.
 

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