E=Ek+Ep
Ek=2mv2
Ep=2kx2
where x offset from equilibrium point position
let A oscillation amplitude,then for x = A:
E=Ek′+Ep′
Ek′=0 etc v=0
Ep=2kA2
E=2kA2
if Ep=Ek:
Ep+Ek=E;
2∗Ep=2kA2
2∗2kx12=2kA2
x1=2A2=0.71∗A
Answer: kinetic and potential energies are equal when shifted
by 0.71*A from the equilibrium point;
A this is the Simple Harmonic Motion amplitude
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