# Newton’s Third Law of Motion

Newton’s Third Law of Motion is a key concept in physics, encapsulating the intrinsic nature of forces. This law illustrates that forces always occur in pairs and that the interactions of objects result in forces that are equal in magnitude and opposite in direction. Its understanding is vital for comprehending a wide range of physical phenomena, from basic motion to complex engineering principles. The law is not only fundamental in theoretical physics but also has practical applications in technology, sports, and everyday life.

## What is Newton’s Third Law of Motion – Definition

Newton’s Third Law of Motion states that for every action, there is an equal and opposite reaction. This means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object. Understanding this law is crucial in physics as it explains how forces come in pairs and how they affect objects.

## What is the Best Example of Newton’s Third Law of Motion?

A classic example of Newton’s Third Law is the action of a rocket launching. As the rocket burns fuel, it expels exhaust gases downward (action), and in response, the rocket is propelled upwards (reaction). This demonstrates the principle of action and reaction forces working in tandem, a vivid illustration of the law in a real-world context.

## Newton’s Third Law of Motion Formula

Newton’s Third Law of Motion is more of a principle rather than a formula, and it is typically stated as: “For every action, there is an equal and opposite reaction.” This law describes the nature of forces and how they interact but doesn’t provide a specific mathematical formula like some other laws of motion.

However, the concept can be expressed in a formula-like notation to illustrate the principle:

F_{action} = -F_{reaction}

In this expression:

- F
_{action}represents the force exerted by the first object on the second object.
- F
_{reaction} represents the force exerted by the second object on the first object.
- The negative sign indicates that these two forces are equal in magnitude but opposite in direction.

## 22 Newton’s Third Law of Motion Examples

Newton’s Third Law of Motion, stating that every action has an equal and opposite reaction, is a key concept in understanding the dynamics of force interactions. This collection of 22 examples provides a broad spectrum of how this law operates in various scenarios, from simple daily activities to complex scientific phenomena. These examples are valuable for teachers, offering clear and relatable instances that demonstrate the reciprocal nature of forces, enhancing students’ comprehension of fundamental physical principles.

**Rocket Launch:** As the rocket expels exhaust gases downward, it propels upward.
**Jumping off a Boat:** Jumping forward pushes the boat backward.
**Rowing a Boat:** Oars push water backward, moving the boat forward.
**Bouncing a Ball:** The ball exerts force on the ground and is pushed up.
**Swimming:** Pushing water backward propels the swimmer forward.
**Recoil of a Gun:** Firing a bullet forward pushes the gun backward.
**Walking:** Feet push the ground backward, moving the body forward.
**Pushing a Wall:** Exerting force on a wall results in an equal force back.
**Hitting a Baseball:** The bat exerts force on the ball, and the ball exerts an equal force back on the bat.
**Trampoline Jumping:** Pushing down on the trampoline springs propels you upward.
**Paddling a Kayak:** The paddle pushes water back, moving the kayak forward.
**Car Braking:** Brakes apply force to wheels, wheels exert equal force back on brakes.
**Sitting on a Chair:** Your body exerts a downward force, and the chair pushes back up.
**Skateboarding:** Pushing the ground backward propels the skateboard forward.
**Bird Flying:** Wings push air down and backward, lifting the bird up.
**Airplane Takeoff:** Engines thrust air backward, moving the plane forward.
**Playing Tug of War:** Forces exerted by each team are equal and opposite.
**A Book Resting on a Table:** The book exerts a downward force; the table exerts an equal upward force.
**Climbing Ladders:** Pushing down on a rung raises the body up.
**Kicking a Soccer Ball:** The foot applies force to the ball, and the ball applies an equal force to the foot.
**Leaf Blower:** Blows air forward, pushing the blower backward.
**Dropping an Anchor:** The anchor exerts force on the seabed, stabilizing the boat.

## Newton’s Third Law Worksheet

## How to Calculate Newton’s Third Law

You can properly use Newtonâ€™s third law to help predict the displacement of the object or if the object has enough tension to maintain a hanging position. If you want to learn more about the 3 laws of Newton and Newtonâ€™s 3rd law, you may use any of Newtonâ€™s 3rd law examples and samples on the links above.

### Step 1: Determine Which Formula You Will Need To Use

There are two formulas people can use to calculate Newtonâ€™s third law. T = W = mg for a free hanging mass and Fnet = T – W for movement. Determine which type of formula you will use for the specific problem.

### Step 2: Write Down and Identify All the Variables

After you have determined the formula you will use, you must write down all the variables the problem has laid out for you. Be sure that each variable in the problem has the correct measurements, if they do not have the appropriate measurements be sure to convert them as necessary.

### Step 3: Substitute the Variables for the Appropriate Things in the Formula

Substitute the given variables to the formula of net force or tension. This will give you the missing value you will need to find in the formula. Be sure to move the unidentified value to the left side of the equation by doing the appropriate steps.

### Step 4: Solve the Solution

Solve for the missing value and be sure it will have the correct measurement associated with the missing value. If it doesn’t have the correct measurement, convert it accordingly.

## FAQs

## What are the uses of Newtonâ€™s third law?

Newtonâ€™s third law of motion allows people to know how much external force is required to disturb the equilibrium or balance of an object to move it in a specific direction. This is important as many of our basic actions and tools require movement. Newtonâ€™s third law will try to explain how much kinetic energy, mechanical energy, potential energy, or electrical energy is needed to disturb an object and move it a specific distance and direction.

## What are real-life examples of Newtonâ€™s third law of motion?

We do many everyday actions that utilize Newtonâ€™s third law of motion. One real-life example of Newtonâ€™s third law of motion you can observe is when a person cuts wood products into small chunks using an ax. The personÂ can unconsciously predict how much force they need to exert to change the raw wood commodityÂ into a small wooden product. Another example we can observe is when a serviceÂ tow truck tows a broken car to the nearest mechanic. The truck will need a specific amount of force to both tow the car and drive in a specific direction.

Newtonâ€™s third law of motion outlinesÂ how an object can displace another object with the appropriate amount of force. When planning to move something heavy or require a lot of energy, it is important to know how to be efficient when doing those said actions.Â