Mechanical devices are tools or machines that use physical components to perform specific tasks. They often consist of parts like gears, levers, and pulleys, which work together to create movement or force. Common examples include bicycles, watches, and elevators, all of which rely on mechanical principles to function effectively. These devices can be simple, like a wheelbarrow, or complex, like a robotic arm. They are designed to make work easier, improve efficiency, or enhance productivity in various fields, including manufacturing, transportation, and everyday life. Understanding how these devices operate helps us appreciate their role in modern technology.