Final answer:
When the body maintains or changes position on a stable surface, it reflects the concept of balance, underpinned by Newton's Laws, particularly the first and third laws of motion.
Step-by-step explanation:
Reactions that are expressed when the body attempts to move or maintain a position on a stable or fixed surface reflect balance. These reactions incorporate concepts from Newton's Laws of motion, which are the foundation of dynamics and explain the forces affecting motion. Newton's first law of motion states that a body at rest tends to remain at rest and a body in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Similarly, Newton's third law indicates that for every action, there is an equal and opposite reaction, which is exemplified when a force exerted by the body on a surface results in a reaction force from the surface that impacts balance.