National League for Nursing (NLN PAX) Practice Exam

A simple machine is a device that changes the direction or magnitude of a force. All of the choices listed are indeed examples of simple machines, each serving a unique purpose in making work easier.

The lever operates on the principle of the moment arm, allowing a small force applied at one end to lift a larger weight on the opposite end. This is achieved through the pivot point (fulcrum) positioned between the input force and the load.

A pulley is used to change the direction of a force. By threading a rope through a wheel, it enables the lifting of heavy loads with reduced effort, especially when multiple pulleys are combined in a system.

An inclined plane allows heavy objects to be raised by applying a smaller force over a longer distance, reducing the effort needed to lift the object vertically.

Since all listed options are indeed recognized as simple machines, the choice indicating "All of the above" encompasses the full range of examples, accurately portraying the variety of simple machines that contribute to mechanical advantage in various tasks.