Last modified on 3 March 2011, at 18:57

Physics Course/Oscillation/Oscillation Side by Side

Oscillation Side by SideEdit

When apply a force on an object of mass attach to a spring . The spring will move a distance y above and below the equilibrium point and this movement keeps on repeating itself for a period of time . The movement up and down of spring for a period of time is called Oscillation

1Edit

The force acts on the object to pull the object down

F = m a

The Restoring Force of spring to push the object up can be calculated by Hook's Law

Fs = - k y

The oscillation stops when the two forces are equal or the net force on object is zero

m a = - k y
y = \frac{m a}{k}
a = - \frac{k}{m} y
t = \frac{k}{m} \frac{y}{v}

2Edit

Any force acting on an object can be expressed in a differantial equation

F = m \frac{d^2y}{dt^2}

Equilibrium is reached when F = Fs

F = m \frac{d^2y}{dt^2} = - k y
F = \frac{d^2y}{dt^2} + \frac{k}{m} y = 0
s^2 + \frac{k}{m} s = 0
s = ± j \sqrt{\frac{k}{m}}
s = e^ j\sqrt{\frac{k}{m}}t +  e^ -j\sqrt{\frac{k}{m}}t
y = A Sin {\frac{k}{m}}t