harp assessment
a harp, an instrument we have not yet seen, makes sounds like all instruments. your teacher will play a video showing a harp making different sounds.
answer the questions below to use what weve learned so far about sound sources to model what we see in this video.
1. what parts of the instrument are the sound sources?
2. what would you expect to see these sound sources doing anytime one of them produces a sound? explain in one sentence.
3. what does the musician need to do differently when she interacts with these sound sources in order to get them to produce softer sounds?
4. draw and label a step - by - step model that shows and describes what the sound source is doing when it makes a sound. step 1 should show what the
sound source looks like before it makes a sound. the middle steps should show what the sound source looks like as it is making a sound. step 5
should show what the sound source looks like when it stops making a sound.
step 1 step 2 step 3 step 4 step 5

Question

Accepted Answer

### Question 1
# Brief Explanations:
A harp produces sound from its strings. When the strings are plucked or strummed, they vibrate, creating sound waves.
# Answer:
The strings of the harp are the sound sources.

### Question 2
# Brief Explanations:
Sound is produced by vibrations, so when a harp string (the sound source) makes a sound, it should be vibrating. This is based on the scientific principle that sound is generated by the vibration of objects.
# Answer:
I would expect to see the sound sources (the harp strings) vibrating whenever they produce a sound because sound is created by the vibration of an object.

### Question 3
# Brief Explanations:
The loudness of a sound from a stringed instrument like a harp is related to the amplitude of the string's vibration. To produce softer sounds, the musician should pluck the strings with less force, which will result in a smaller amplitude of vibration and thus a softer sound.
# Answer:
The musician needs to pluck the harp strings with less force to get them to produce softer sounds, as less force will cause the strings to vibrate with a smaller amplitude, resulting in a softer sound.

### Question 4
# Brief Explanations:
- **Step 1**: Before making a sound, the harp string is at rest, not vibrating. It is in a straight, still position.
- **Step 2**: When the string is plucked (the action to start sound production), it begins to move from its rest position, starting to vibrate.
- **Step 3**: As the string vibrates, it moves back and forth (oscillates) around its rest position, creating sound waves.
- **Step 4**: The string continues to vibrate with a consistent motion (if the plucking force is constant) as long as the sound is being produced.
- **Step 5**: When the sound stops, the string stops vibrating and returns to its original, still (rest) position.

| Step 1 | Step 2 | Step 3 | Step 4 | Step 5 |
| --- | --- | --- | --- | --- |
| A straight, still harp string (at rest, no vibration). | The string starts to move (vibrate) after being plucked. | The string oscillates (moves back and forth) with visible vibration. | The string continues to vibrate as the sound is produced. | The string stops vibrating and returns to its straight, still (rest) position. |

# Answer:
| Step 1 | Step 2 | Step 3 | Step 4 | Step 5 |
| --- | --- | --- | --- | --- |
| A straight, still harp string (no vibration). | The string starts to vibrate after being plucked. | The string oscillates back and forth (vibrating). | The string keeps vibrating as sound is made. | The string stops vibrating and is still (back to rest). |

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