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Immovable joints in the skull would affect the brain. If the brain moved around due to these immovable parts, then people would have brain damage.
Movable joints can be moved, immovable joints can not.
A fibrous joint is an immovable joint. An example would be the bones in the skull.
nothing would happen...
Chaos
If the unstoppable object was smaller, then it would pierce a hole through the immovable object, not moving the object, and not stopping.
you would not be able to move fluently much less stand. It would be like a human ironing board. All movement requires the existence of joints. The legs require the existence of the "Greater Trochanter" which is the hip socket joint, in order for the lower extemities to move back and forward.
The intercarpals (in between the finger bones and wrist) and the intertarsals (just below the ankle)
If there were no freely movable joints in the body, then our bones cannot bend and stretch and we would have become like a statue.
The "sutures" are fibrous (immovable) joints between the plates of the skull, which must expand apart with age.
If you are a politician, that would probably be "proximity" but, the answer that you are probably looking for is "immovable joints". The skull is composed of around 22 bones but the only movable joints in an adult are the mandibular joints and the joint at the uppermost cervical vertebra, the "atlas". The pelvis of an adult human is, likewise, composed of the ilium, ischium, pubis and the os coxae. Those bones are all held together by immovable joints, too.
Suture joints are practically immovable joints. You can find them in case of skull. They are there in case of skull, probably to allow the growth of individual bone, in order to increase the size of skull. With out joints, it would be very difficult to increase the size of the skull.