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### 9 Cards in this Set

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 What is the force in simple harmonic motion F=-kx What is the potential energy in simple harmonic motion PE=1/2*k*x^2 (integral of force) what are the units of k N/m why is simple harmonic motion simple the frequency does not depend on amplitude(displacement from equilibrium) How is frequency related to k? w=Root(k/m) WORKEM therefore f=1/2pi*root(k/m) what is the frequency of the pendulum w=root(g/l) WIGGLE f=1/2pi*root(g/L) what are the mnemmonics for SHM? WORKEM and WIGGLE w=Root(k/m) w=root(g/l) What is the spring constant k? k is essentially how stiff the spring is higher k is more stiff so higher restoring force If you have a spring hanging from the ceiling of an elevator with a mass on it and the elevator is accelerating (a) How would eq. length of spring compare to eq length when not accelerating forces on sprin F=T-mg and F=ma thus T=mg+ma and T=kx (if there is no mass on the spring then T must equal 0 because m=0 and x=0 x is disp from eq.) therefore x is max when a is positive which is up kx=mg+ma