**Galileo** , through his speeches and mathematical demonstrations, had managed to explain the **movement** that was involved in the **fall** of the bodies and the **trajectory** of the projectiles. Putting aside Aristotle’s speculations on motion, he founded **kinematics** on scientific and experimental bases , that is, the part of **mechanics** that describes the **motion** of bodies regardless of the **forces** that produce it. From these studies, **Newton** managed to develop **dynamics** , a science that studied the relationships that occurred between the**forces** and the **movements** that they originate. In the second section of the **Mathematical Principles** of Natural Philosophy, Newton established the three ** “axioms or laws of motion** .

*“*## What is Newton’s third law?

The **Newton ‘s third law** tells us that the **interactions** that occur between two bodies are always **equal** but will be directed in **direction ****opposite** to the first body that for every **action** there is a **reaction** .

- What is Newton’s third law?
- What is your name
- Who proposed it
- History
- Statement
- Characteristics of Newton’s third law
- Formula
- Target
- Explanation
- Applications of Newton’s third law
- Experiment
- Examples
- Conclution

## What is Newton’s third law?

The law is that when an object displays a **force** on another **object** , the second object exerts a force of equal **magnitude** and **direction** opposite the first. When any type of interaction occurs, there is also a pair of **action** and **reaction forces** , whose **magnitude** is equal and the **directions** are opposite. These forces occur in pairs, so the pair of action and reaction forces form an interaction between two objects.

## What is your name

Newton’s third law is also known as the **action and reaction principle** .

## Who proposed it

Newton’s third law is completely unique to **Isaac Newton** . Let us remember that the other two laws already had an elaborate scientific basis for Galileo, Hooke and Huygens.

## History

The Third Law as its name implies was created by **Isaac Newton** , when he began to wonder why **objects** were **moving** . The story of the third law is based on an apple, and how the scientist inspired his knowledge from the fall of an apple from a tree.

## Statement

The original statement of the law says the following:

**“Action is always opposed an equal reaction: or the mutual actions of two bodies are always equal, and directed opposing parties.”**

In Spanish, this statement says the following: with every **action** an equal and opposite **reaction** always occurs : it means that the mutual actions of two bodies are always **equal** and **directed** in the opposite direction.

## Characteristics of Newton’s third law

The main characteristics of Newton’s third law are as follows:

- It is an original law formulated by
**Isaac Newton**. - One object exerts a
**force**on a**second object** - Forces never occur
**individually**, but rather in equal and opposite pairs. - It is only possible to work in
**a vector way,**since like any vector it has**magnitude**,**direction**and**meaning**. - The
**action**and**reaction force**act at the same time with the same magnitude and direction but in the opposite direction. - The direction is given by the
**angle**of**inclination**of both forces.

## Formula

Mathematically, the third law of motion of Newton can be expressed by the following formula: **F1 = F2** ‘Where F1 is the **force** that **acts** on the body 1 and F2′ force **reactive** acting on the body 2.

## Target

The main objective of Newton’s third law is to identify the types of **forces** involved in the **motion** of objects. He also made great contributions to **classical mechanics** as it is a system that explains how **force** is related to the **movement** of bodies.

## Explanation

This law explains the forces of **action** and **reaction,** which are forces that can be exerted by all bodies that come into contact with another. These forces are equal but at the same time they are **opposite** in the aspect of the **direction** . Every time one body exerts force on another, the latter also exerts force on the first object.

In Newton’s third law, what we know as the **action force** intervenes and this force is the one that is exerted by the **first body** that makes force on the other, and the **reaction force** also intervenes , which is the one possessed by the body that **receives** and **reacts** .

## Applications of Newton’s third law

Some of the applications in which we can observe the third law are the following:

**Row**in boats.- Takeoffs
**rockets**. - A being in
**position**of**standing**on the ground. - In
**gun shots**. - It is also used in
**structures**and**buildings**. - Satellite
**repair**.

## Experiment

#### The Reactive Balloon

**Materials:**a**balloon**,**string**,**tape**, and an L-shaped**straw**.**Procedure:**first we must**inflate**the balloon, then we put the folded straw in the**mouth**of the**balloon**and it is**fixed**with adhesive tape. On the line of the largest**diameter**of the balloon, we glue the end of the thread and hold the other end of the thread at a certain**height**. Hold the**balloon**and you will see the balloon spin as it deflates.

## Examples

Some examples of Newton’s third law are:

- When we swim in a pool because when we look for the wall and push ourselves to get momentum we can detect an
**action**and a**reaction**. - When a
**nail**is**hammered**into a surface, the hammer makes a backward motion, which is identified as the**reaction**to its**own blow**. - When a
**person**pushes another with a**similar body**. In this case, the person will not only go back but also the one who pushed him. - When
**you are rowing**a**boat**because while move the**water**to**back**with the paddle, it reacts pushing the boat in its**opposite direction**.

## Conclution

Newton’s third law explains the forces of **action** and **reaction** and teaches us that they are forces that we can find in all bodies when they are in contact with each other, that they are **equal** but at the same time are **opposite** ; they have the same **module** and **sense** , but in **direction they** are **opposite** . By this we mean that one body exerts a force on another but that this other also exerts a force on it.

We know by the name of **action** force the force that is exerted by the first body and therefore, we call the **reaction force** that which is originated by the body that receives and reacts to the force.