Exam-style question
Try this first
What are forced vibrations?.
- A.Vibrations that occur without any external force
- B.Vibrations that are maintained by an external force
- C.Vibrations that occur at a constant frequency
- D.Vibrations that are damped over time
Model answer
What a good answer should say
- Vibrations that are maintained by an external force
Explanation
Why this works
Forced vibrations are defined as oscillations that occur due to an external force acting on the system. The key difference between forced and free vibrations is that forced vibrations depend on the frequency of the external force, while free vibrations depend on the system's natural frequency.
Forced vibrations apply when an external force continuously drives the system, such as a child on a swing being pushed. Thus, the correct option accurately describes forced vibrations.
Common mistake
No common mistake is linked to this question yet.