Lesson 84 of 84 · Forces
Experiment⭐ 30 XP⚡ Spark LabSmooth and Rough Surfaces (Part 3)
Smooth and Rough Surfaces (Part 3).
🎯 Your mission
Predict it first. Then prove yourself right (or wrong).
⚡ The twist
Energy never disappears — it just hides somewhere else.
Mind = Blown
⚡ Static electricity is the same physics as lightning, just smaller.
Make a hypothesis first
Before you start: which will move faster, and why?
What You'll Learn
When two surfaces rub together, friction produces heat. Rub your hands together to feel it!
Key Words
- push
- pull
- balance
Materials Needed
- marbles
- paper clips
- rubber bands
- blocks
- spring scale
Safety First
- Do not mix unknown chemicals together.
Steps
Look at the picture and read the labels.
Drop a feather and a coin at the same time from the same height. Which hits the ground first?
Draw a picture of what you observe.
Share your results with a partner.
Check Your Understanding
Question 1
1 of 3What happens when opposite poles of magnets meet?
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 this experiment
Send it to a parent who's looking for a 10-minute kitchen science win.
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