Lesson 77 of 84 · Light and Sound

Lesson⭐ 30 XP⚡ Spark Lab

Fair Tests: Changing One Thing (Part 4)

🧪Lab Brief #77

Light and Sound.

🎯 Your mission

Understand the idea. Then look for it everywhere.

⚡ The twist

Energy never disappears — it just hides somewhere else.

🤯

Mind = Blown

🎢 You feel weightless on a roller coaster because you and the seat are falling at the same speed.

🔮

Make a hypothesis first

Before you start: which will move faster, and why?

What You'll Learn

A fair test changes only one thing. If you change two things, you will not know which one made the difference.

Key Words

problem
solution

Steps

Step 1 — Read

Look at the new words. Can you say each one?

Step 2 — Do

Design a boat from foil that can hold the most pennies without sinking.

Step 3 — Observe

Use your senses to describe what you notice.

Step 4 — Record

Write 1-2 sentences about what happened.

Check Your Understanding

Question 1

1 of 3

What does 'predict' mean?

How sure are you going to be?😐 maybe

🌍

Where you see this in real life

You use this every time you flip a light switch, ride a bike, or kick a ball.

🏆

Stretch Challenge

Try this in real life this week.

Time how long a small ball rolls down something, then change the slope and try again.

👨‍👩‍👧

For the dinner table

“Show me something at home that uses this kind of energy.”

🎯

Next Smart Experiment

We'll pick an experiment that matches exactly how you're thinking right now.

🌡️Share card

Share this experiment

Send it to a parent who's looking for a 10-minute kitchen science win.

🖨️

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