Newton's Third Law: Action and Reaction

Lab Brief #2

🎯 Your mission

Set it up. Test it. Be amazed.

⚡ The twist

Energy never disappears — it just hides somewhere else.

What you'll learn

Newton's third law states that for every action there is an equal and opposite reaction. When you push against a wall, the wall pushes back on you with the same force.

Key words

force
A push or pull that can make an object move or stop.
Newton
A unit that measures how much force is pushing or pulling something.

Make a hypothesis first

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

Say your guess out loud — then find out if you were right.

Get ready

🧰 What you need

string

⚠️ Safety first

Small parts and balloon fragments are a choking hazard — keep them away from young children.

Step 1 of 4 · Read

Look at the vocabulary words and write a definition for each in your own words.

Step 2 of 4 · Do

Test Newton's Third Law: blow up a balloon, attach it to a straw on a string, and release. Measure how far it travels with different amounts of air.

Step 3 of 4 · Observe

Note any unexpected results and think about why they happened.

Step 4 of 4 · Record

Share your findings with the class or a partner and discuss what you learned.

Question 1 of 3

What does Newton's third law state?

How sure are you?😐 maybe

Question 2 of 3

What unit is force measured in?

How sure are you?😐 maybe

Question 3 of 3

What is the formula for Newton's second law?

How sure are you?😐 maybe

Mind = blown

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

Nice work!

You got 0 of 3 right.

Next: Momentum in Motion All lessons

🎯

Next Smart Experiment

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✨ More to explore

🌍 Where you see this in real life: This is why airplanes can fly and why rockets reach space.

🏆 Stretch challenge (try it 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.”

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