1. Copy the learning objective into your science notebook
Newton’s 3rd Law
New page
Date and Title
Copy the learning objective into your science notebook

2. Newton’s 3rd Law Every action has an equal and opposite reaction.
Also called the
Action – Reaction Law

3. Overview

4. Understanding Action – Reaction Demonstration: Balloon and wire
Students will draw in their notebooks:

5. Activity
Students will line up along the wire where they think the balloon will stop.
Teacher will release the balloon.
Discuss results

6. Notes
In the notebook, label the directional arrows for Newton’s 3rd Law.
Explain why the balloon moved using these terms: action, reaction, forward motion and force

7. Same concept Different object
Explain how a rocket ship leaves Earth to go into space.
Draw a rocket ship on the ground.
Describe lift off.
Use these words additional words: thrust and gravity

8. Test questions Why do rockets move up towards space?
Thrust is greater than gravity.

9. What is Newton’s third law of motion?
Action and reaction forces.

10. With a constant force, what will make acceleration decrease?
Increase the mass.

11. Action forces and reaction forces are described by which of Newton’s Laws?
Third law of motion.

12. What changes when an unbalanced force acts on a moving object?
Either speed or direction.

13. Review of previous questions.
Answer out loud… the more the merrier!

14. Objects in motion will _______________ until acted upon by another force.
(remain in motion)
Inertia is described by Newton's ________ law of motion.
(1st Law)
What might cause a car parked on a hill to start to roll backwards?
(unbalanced force)
Balanced forces are always opposite in ______________
(direction)
According to Newton's second law of motion, what is the relationship between mass and acceleration?
(Inversely proportional to each other)