"Механічні" refers to mechanical systems or devices that operate based on physical principles. These systems often involve the movement of parts and can include anything from simple machines like levers and pulleys to complex machinery such as engines and robots. The study of mechanics, a branch of physics, helps us understand how these systems work and how forces interact within them. In everyday life, "механічні" devices are all around us. For example, a bicycle uses mechanical principles to convert human energy into motion, while a car engine transforms fuel into mechanical energy to power the vehicle. Understanding these mechanical systems is essential for engineering and technology development.