Practical Investigation: Vibrations and Sound. PART A: 20 Marks. A group or Grade 4 learners are learning about how sound is produced. Their teacher explains that sound is made when objects vibrate. The learners decide to investigate whether different materials vibrate and produce different sounds.

Here are the answers to your questions:

1.
The aim is:
To investigate whether different materials vibrate and produce different sounds.

$$\boxed{\text{To investigate whether different materials vibrate and produce different sounds.}}$$

2.
An investigative question for this investigation is:
Do different materials vibrate and produce different sounds?

$$\boxed{\text{Do different materials vibrate and produce different sounds?}}$$

3.

• When you pluck the ruler on a desk, the ruler will vibrate rapidly, and a sound will be produced.
• When you pluck the rubber bands, they will also vibrate, and a sound will be produced. The sounds from the rubber bands will likely be different from the sound of the ruler, and different rubber bands may produce different sounds.