Intro to Millwright Practice Exam

A wheeled pry bar is commonly referred to as a Johnson Bar. This tool features a wheel that allows it to be easily maneuvered, making it particularly effective for lifting and moving heavy objects. The design of the Johnson Bar incorporates a long lever, which amplifies the force applied by the user, enabling them to leverage heavy loads with less effort. This is a fundamental principle in mechanics, as it utilizes the concept of leverage.

The other choices represent different tools or concepts. A wrecking bar is a type of crowbar with a slightly different design and is primarily used for demolition work. A shovel is primarily a digging tool and does not have the same functionality as a pry bar. Lever is a general term in physics referring to a simple machine that can amplify force, but it does not specifically denote the wheeled version used for prying. Hence, Johnson Bar is the most appropriate name associated specifically with a wheeled pry bar.