​Language Support.

1. Control variable - A variable that you keep the same during your investigation.

2. Dependent variable - The variable that you observe or measure.

3. Independent variable - A variable that you can change.

Tuning Fork in glass of water.

Watch a clip about tuning fork in a glass of water.

1. Observe the ripples in the water.

   Explanation.​

2. The sound vibrations are transferred from the vibrating tuning fork to the water.​

​

​Main Activity.

​

​

Look at the learners book page 33

​

​Explanation.

The rice grains on the plastic wrap move or vibrate when you hit the jar, bang the metal tray or clap your hands.

Banging the metal jar sets up sound vibrations which travel through the air and make the plastic wrap vibrate. These vibrations cause the rice grains to vibrate​.

​

​

​

​Notes.

Sounds are made when things vibrate. A vibration is a very quick movement back and forth. You often can not see vibrations but you can feel them.​

​

​

​

​

​

What have you learn't.