Mechanical machines are devices that use physical components to perform work. They can convert energy from one form to another, often using levers, gears, and pulleys to create movement. Common examples include cars, bicycles, and cranes, which help in transportation and construction. These machines operate based on principles of physics and engineering. They can be simple, like a wheelbarrow, or complex, like a robotic arm. Mechanical machines are essential in various industries, improving efficiency and productivity in tasks ranging from manufacturing to everyday activities.