Lesson 84 of 84 · Forces

Experiment⭐ 30 XP⚡ Spark Lab

Smooth and Rough Surfaces (Part 3)

🧪Lab Brief #84

Smooth and Rough Surfaces (Part 3).

🎯 Your mission

Run the experiment. Find out what really happens.

⚡ The twist

Speed isn't the same as force. Don't mix them up.

🤯

Mind = Blown

⚡ Static electricity is the same physics as lightning, just smaller.

🔮

Make a hypothesis first

Guess: where does the energy go?

What You'll Learn

When two surfaces rub together, friction produces heat. Rub your hands together to feel it!

Key Words

push
pull

Materials Needed

toy cars
ramps
string
weights
tape
ruler

Safety First

Adult supervision recommended.
Do not taste any materials.

Steps

Step 1 — Read

Look at the picture and read the labels.

Step 2 — Do

Drop a feather and a coin at the same time from the same height. Which hits the ground first?

Step 3 — Observe

Draw a picture of what you observe.

Step 4 — Record

Share your results with a partner.

Check Your Understanding

Question 1

1 of 3

What happens when opposite poles of magnets meet?

How sure are you going to be?😐 maybe

🌍

Where you see this in real life

This is why airplanes can fly and why rockets reach space.

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Stretch Challenge

Try this in real life this week.

This week, find one thing in your house that turns one kind of energy into another.

👨‍👩‍👧

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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