question_answer

For a harmonically excited single degree of freedom viscous damped system, which one of the following is correct?

A) Inertia force leads damping force by \[90{}^\circ \] while damping force leads spring force by\[90{}^\circ \].

B) Spring force leads damping force by \[90{}^\circ \] while damping force leads inertia force by\[180{}^\circ \].

C) Spring force and damping force are in phase, and inertia force leads them by \[90{}^\circ \]

D) Spring force and inertia force are in phase, and damping force leads them by \[90{}^\circ \]