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Question
The following diagram shows the displacement – time graph of the vibrating body.
- Name the kind of vibrations
- Give one example of such vibrations.
- Why is the amplitude of vibrations gradually decreasing?
- What happens to the vibrations of the body after some time?
Solution
- Damped vibrations
- Example: When a slim branch of a tree is pulled and then released, it makes damped vibrations.
- The amplitude of vibrations gradually decreases due to the frictional (or resistive) force that the surrounding medium exerts on the body vibrating in it. As a result, the vibrating body continuously loses energy in doing work against the force of friction, causing a decrease in its amplitude.
- After some time, the vibrating body loses all of its energy and stops vibrating.
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