# Newtons Third Law

Sub Topics:
• Examples of Newtons Third Law
• Newtons Third Law Formula

• Newtons third law states that most forces exist in pairs: if one object A exerts a force FA over a second object B, after that B simultaneously exerts a force FB on A, and also the two forces are usually equal and opposite: FA = -FB. The third law signifies that all forces are usually interactions among different bodies and therefore that there is no such thing like a unidirectional force or even a force that acts on just one body. This law might be known as the action-reaction law, with FA called the "action" as well as FB the "reaction". The action and also the reaction are simultaneous, and it doesn't matter which is called the action and which is called reaction; both forces are part of a single interaction, nor does force exist without the other.

## Examples of Newtons Third Law

Newton's Third Law states that, action and reaction are usually equal as well as opposite. A bird pushes air down while flying (action), because forces result from mutual interactions, the air also needs to be pushing the bird upwards (equal as well as opposite reaction). This enables the bird to fly :)

Example,

When sitting on a chair, the body exerts a force on the chair and also the chair exerts an equal force back if the chair didn't exert exactly the same force you would fall on your butt.

Newtons third law states that whenever you apply a force with an object the object applies exactly the same force within the opposite direction.

For every action it has an equal and also opposite reaction.

## Newtons Third Law Formula

Newton's third law of motion “to each and every action, it has an equal and opposite reaction”. That's, if a body A exerts the force upon another body B, then a body 'B' also exerts the same and opposite force on the body 'A'. The gravitational force existing from a stone and also the Earth. Whenever a stone is dropped from the height it falls on the Earth. The reason being the Earth exerts a force on the stone and based on the universal law of gravitation, the stone also exerts the same force on the Earth. Now the question is why we don't see the Earth moving towards the stone. According to Newton's second law of motion, Force acting on an object = mass with the object x acceleration stated in the object formula to find out acceleration inside the object.

Based on Newton's law of gravitation, the force of attraction involving the Earth and the object is given through the equation

Formula to find force of attraction

Where F may be the force,

G = gravitational constant = 6.6734 x 10-11 Nm2/kg2

m1 = Mass of the Earth = 6 x 1024 kg

m2 = Mass with the object = 1 kg

d = distance between the object as well as the Earth = height from the ground + radius of the Earth Radius of the Earth = 6.4x106 m = 6400000 m.

d = 1 + 6400000 m

= 6400001 m