Little Lab Coats

📞〰️ Cup-String Sound Sender

Grade 1 Free Unit Sample — 1-PS4 · Sound & Light

📚 Grade: Grade 1🔬 Domain: Physical Science⏱️ Time: 30–45 minutes

Showcase sample

Build a cup-and-string phone, test loose versus tight string, and feel vibrations become a message.

Sound starts with vibrations, and vibrations can carry information from one place to another.

Colorful illustration for Cup-String Sound Sender showing the main investigation setup.

📋 NGSS Alignment:
1-PS4-1 / 1-PS4-4 — Plan investigations of sound vibrations and use light or sound to communicate.

🎯 Learning Objective

Students will build a simple cup-and-string phone, observe vibrations, and explain how sound can carry a message.

💡 The Big Idea

Sound starts with vibrations, and vibrations can carry information from one place to another.

Three-step science snapshot for Cup-String Sound Sender.

Sound travels through vibrations

The diagram makes the invisible idea visible: voice vibrations move the cup, the string, and the listening cup.

Build the sender
Compare loose and tight string
Connect vibration to message

🔬 Key Vocabulary

soundvibrationcommunicatemessagestringevidence

📦 Materials

2 paper cups
String or yarn
Paper clip or tape
Pencil for adult hole-starting
Partner
Worksheet

🧪 Investigation

Step 1 — Build the sender
With adult help, connect two cups with string.

Step 2 — Send a whisper
One person speaks softly into a cup while the other listens.

Step 3 — Change string tension
Try loose string and tight string.

Step 4 — Feel for vibration
Gently touch the cup or string while someone speaks.

Step 5 — Record evidence
Mark which setup carried the message best.

Step 6 — Explain
Student connects vibration to communication.

💬 Discussion Questions

What did you feel when someone spoke?Use evidence from the activity in your answer.

Which string position worked best?Use evidence from the activity in your answer.

How did sound help send information?Use evidence from the activity in your answer.

🚀 Extension

Try this next: Ask your child to repeat one part of the test tomorrow or with one changed material, then explain what stayed the same and what changed.

👩‍🏫 Parent/Teacher Notes

At-home win: This free sample is complete enough to teach today and polished enough to show how a full Little Lab Coats lesson feels.
Evidence move: Press students to point to a mark, drawing, comparison, or observation before they explain.
Family-friendly pacing: If attention is short, do steps 1–4 today and the worksheet discussion later.

Student Worksheet

Name: ________________________ Date: ________________________

1️⃣ Record your evidence

Test	Message heard?	Evidence
Loose string
Tight string
Touch the cup

2️⃣ Draw your model or best evidence

Draw what you observed.

3️⃣ Explain with evidence

🔑 Parent Answer Key

What success looks like

A strong answer says the tight string carried vibrations better and helped the partner hear the message.

Student names the important observation or test result.
Student uses unit vocabulary in a simple sentence.
Student connects evidence to the science idea instead of guessing.