I'm wondering if there is any case in nature/physics where it has been observed "where there is an action, there is not necessarily an exact equal and opposite reaction".
Or is there some way/case where one can diminish the equal and opposite reaction effect. I'm looking specifically in the area of fluid dynamics / aerodynamics, but it can be any area.
All forces occur in pairs. There are no isolated forces. See; http://hyperphysics.phy-astr.gsu.edu/hbase/Newt.html
As stated in the link, there are no known exceptions.
Hope this helps
While Newton's Third Law of Motion is a fundamental principle in physics, there are some situations where it may appear to be violated or where the reaction force is not immediately apparent. However, it's important to note that in reality, the law still holds true when all forces are properly accounted for.
Lift in Aircraft: When an aeroplane generates lift, it pushes air downwards. The reaction force (upward lift) is spread across the entire wing surface, making it less concentrated than the downward force on the air.
Propulsion in Fish and Birds: Fish push water backwards to move forward, and birds push air downwards to fly. The reaction forces are distributed throughout the surrounding fluid, making them less apparent.
Rocket Propulsion in Space: It was once believed that rockets couldn't work in space due to the lack of something to "push against." However, the reaction force comes from the expulsion of exhaust gases, not from pushing against an external medium.
Magnetic Levitation: In maglev trains, the repulsive force between magnets might seem one-sided, but there's an equal and opposite force acting on the stationary magnets in the track.
Streamlining: In aerodynamics, streamlining reduces drag by minimizing turbulence, effectively spreading out the reaction forces over a larger area.
Active Flow Control: Techniques like boundary layer suction or blowing can alter the distribution of forces on an object moving through a fluid.
Supercavitation: Used in high-speed underwater propulsion, this technique creates a gas bubble around an object, reducing water resistance.
Electromagnetic Interactions: In some cases, the reaction force might be carried by the electromagnetic field itself, making it less apparent.
Gravitational Systems: In celestial mechanics, the reaction forces between massive bodies are distributed through gravitational fields.
Note that in all these cases, Newton's Third Law is not actually violated. The reaction forces are always present, but they may be distributed, delayed, or manifested in ways that are not immediately obvious. The law remains a cornerstone of classical physics, and any apparent violations are usually due to incomplete analysis or overlooking certain forces in the system.
