Pre-class Example #1: Student Responses

 

1. What is the phase difference between the drive and the motion?

2. Why does this phase difference yield the largest response?

  1. the drive and the force are in phase so there is no counteracting force (except for damping).

  2. the drive and the force are p / 2 out of phase to create a delay between the force application and the system response.

  3. the drive and the force are p / 2 out of phase so the force always acts in the direction of the motion.  (CORRECT)