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Newton's Third Law

the year 1687, Sir Isaac Newton announced his laws of motion, where he standardised how large objects move due to the effect of forces applied externally. Moreover, the third law of motion, also known as the law of action and reaction proved to be the most significant one.

Law Of Action And Reaction or Newton's Third Law Of Motion DefinitionThis law says that every action has an equal and opposite reaction. For example, if body A puts force Fa on body B, then B at the same time exerts force Fb on body A. Moreover, both the forces acting on each body have the same magnitude and in reverse direction: Fa = - Fb. Furthermore, in some instances, direction and magnitude are decided entirely by one body between these two. For example, consider object A is putting force on object B. Then, the force acting on object B is "action", and this opposite force on object A is "reaction." As said before, this law is also referred to as action-reaction pair law where Fa and Fb are action and reaction, respectively. However, in some cases, both bodies together determine direction and magnitude. In this scenario, it is not relevant to point out which force is "action” and which one is "reaction." Moreover, action and reaction occur concurrently, and both of them belong to a sole interaction, and none of them occurs without each other. Your Earth pulls down on you, as you probably already know. The Earth is also pulling up on you, but you don't realise it. A gravity force of 500 N is exerted by the Earth on you, similarly, you exert a gravitational force of 500 N on the Earth. The third law of motion explains this remarkable fact.As Newton argued in his third law, if an object exerts a force on another, it must exert a force of the same magnitude and opposite direction on the object it repels.The law of symmetry in nature says that force always occurs in pairs, and one cannot exert force on another body without experiencing it. This law is sometimes loosely referred to as action-reaction, where the force exerted is the action, whilst the force experienced is the reaction.Additionally, action-reaction pair law is seen in everyday life. Take a look at some Newton's third law of motion examples below:A person Walking on the RoadWhen a man or woman is out on a stroll, he/she exerts force in a backwards direction on the ground. On the other hand, the ground puts a forward directional force to the man/woman that makes him/her move forward. Swimming Another Newton's 3rd law example is when an individual is swimming, he/she pushes the pool water backwards. In return, the water pushes the swimmer in a forward direction, which makes him/her proceed.Flying BirdAgreeing with Newton's third law, a bird pushes air downwards with the help of its wings. Conversely the air helps the bird to move in the upward direction.