Thus if we let the solution is proven to be . Energy oscillates between electric and magnetic forms. Show that when the electric energy is at its maximum, the magnetic energy is zero and visa versa. When the cosine function is one, the sine function is zero and visa versa . Thus a phase of either zero or would be suitable.
Energy oscillates between kinetic and potential energy in the spring.
The forces on the mass are its weight, mg , and the tension in the string. If we consider the torque about the top of the string, the tension causes no torque since it acts through that point. The torque due to the weight is where we've used the small angle approximation . The equation relating torque to angular acceleration is . Here the rotational inertia of a single mass, m , a distance from the axis of rotation is .