Friction is a critical factor influencing the performance, efficiency, and longevity of mechanical systems. This paper presents a comprehensive study on the impact of friction within various mechanical mechanisms, encompassing both theoretical analysis and experimental validation. By analyzing frictional forces in components such as gears, bearings, and sliding mechanisms, we examine how friction affects energy consumption, wear, and mechanical efficiency. Our study utilizes analytical models alongside finite element simulations to predict the behavior of frictional interfaces under different operational conditions, including load, speed, and lubrication. Additionally, experiments are conducted to validate theoretical predictions and evaluate the effectiveness of various friction-reducing strategies, such as surface coatings, lubricants, and material modifications. The findings underscore the importance of friction management in optimizing mechanical design and offer insights into sustainable practices for prolonging the life of mechanical components. This research provides valuable data for engineers and designers seeking to enhance system performance while mitigating the adverse effects of friction.