What is a self adjusting force? I searched it everywhere on internet but not got my answer and I have no other source to get its answer except this site so please help me.
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Assuming the interpretation I suggested in the comments is correct.
Consider the normal support force.
It is an expression of the solidity of the surface that won't allow interpenetration. In order for penetration to not happen, there must be a force to prevent the supported object from accelerating toward the surface. Ultimately the origin of this behavior is found in inter-molecular forces, but at the macroscopic scale it's character is that it automatically takes on exactly the value need to prevent interpenetration without hurling the object off the surface (at least until the surface start to deform significantly or undergoes catastrophic failure).
In this sense the normal force adjusts itself.
Other examples of forces that behave this way are static friction and the tension in a rope or cord.
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The magnitude of static friction adjust its value to the applied force hence static friction is called self adjustable....
Kyle Kanos
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