Advertisements
Advertisements
Question
When a body vibrates under a periodic force, the vibrations of the body are ______.
Options
natural vibrations
Damped vibrations
Forced vibrations
Resonant vibrations
Advertisements
Solution
When a body vibrates under a periodic force, the vibrations of the body are forced vibrations.
Explanation:
A body's vibrations that take place under the influence of an external periodic force acting on it are called forced vibrations.
RELATED QUESTIONS
Distinguish between the free (or natural) and forced vibrations.
Give one example to illustrate forced vibrations.
Which characteristic of sound makes it possible to recognize a person by his voice without seeing him?
In fig. , P, Q, R and S represent test tubes each of height 20 cm which are filled with water upto heights of 10 cm, 14 cm, 16 cm and 18 cm respectively. If a vibrating tuning fork is placed over the mouth of test tube Q, a loud sound is heard.
(i) Describe the observations with the tubes P, R and S.
(ii) Give the reason for your observation in each case.
(iii) State the principle illustrated by the above experiment.
In Fig. A, B, C and D are four pendulums suspended from the same elastic string XY. The lengths of pendulum A and D are equal, while the length of pendulum B is shorter and of the pendulum C is longer. Pendulum A is set into vibrations.
- What is your observation about the vibrations of pendulum D?
- Give reason for your observation in part (a).
- What type of vibrations take place in pendulums Band C?
- Give reason for the answer in part (c).
Explain why are soldiers asked to walk out of step while crossing bridges?
Explain why does the rear mirror of a motorbike start Vibrating Violently, at some particular speed of motorbike?
Explain free and forced vibrations. Give an experimental arrangement to illustrate the phenomenon of resonance.
