Mtanie Activity Minnle I. Problem: How is sound energy formed? II. Materials: stick or ruler, cellphone, whistle, rattle, rubber band III. Procedures: 1. Gather all the instruments. 2. Operate these instruments to produce sound. Write your answer in a table like this. Materials What did you do with the materials to produce sound Energy formed when they were operated 1. cellphone 2. rattle 3. whistle A 4. rubber band 4 # 5. ruler IV. Guide Questions: 1. What are the materials that produced sound? 2. What is the common movement of the materials shown? 3. How is sound produced? 4. What is sound energy? 5. How does sound energy help you? ​