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# 3rd Law of Motion Example

Newton’s Third Law of Motion states that for every action, there is an equal and opposite reaction. It is also sometimes called the law of action and reaction. This means that whenever one object exerts a force on another object, the other object exerts a force of equal magnitude but opposite direction on the first object.

The third law can be expressed mathematically as follows:

F12 = -F21

where:

• F12 is the force exerted by object 1 on object 2
• F21 is the force exerted by object 2 on object 1

The third law is fundamental to our understanding of the world around us. It explains why objects move when they are pushed or pulled, and why they stop moving when they are no longer being pushed or pulled. It also explains why rockets work and why airplanes fly.

Here are some examples of the third law in action:

• When you push on a wall, the wall pushes back on you with the same amount of force.
• When a rocket engine fires, the rocket pushes against the exhaust gasses with the same amount of force that the exhaust gasses push against the rocket.
• When an airplane wing moves through the air, the air pushes up on the wing with the same amount of force that the wing pushes down on the air.

The law of action and reaction is a fundamental law of physics that states that for every action, there is an equal and opposite reaction. This means that whenever one object exerts a force on another object, the second object exerts an equal force in the opposite direction.

The law of action and reaction is a consequence of Newton’s third law of motion, which states that the total momentum of a closed system remains constant. In other words, the momentum of an object cannot change unless an external force is applied.

The law of action and reaction has many applications in everyday life. For example, when you push on a wall, the wall pushes back on you with the same amount of force. This is why it is difficult to move a heavy object.

Another example of the law of action and reaction is the recoil of a gun. When a gun is fired, the gunpowder explodes and pushes the bullet forward. At the same time, the gun recoils backward with the same amount of force.

The law of action and reaction is also important in space travel. When a rocket engine is fired, the exhaust gases push the rocket forward. At the same time, the rocket recoils backward with the same amount of force. This is why rockets need to carry a large amount of fuel in order to reach orbit.

The law of action and reaction is a fundamental law of physics that has many applications in everyday life and in space travel.