Machine
Machine explained in an easy to understand way:
Imagine trying to open a tightly sealed jar of pickles. Just like how you might use a rubber grip or a towel to make it easier to twist open the jar, a machine like a lever or a pulley helps make work easier by changing the size or direction of the force you apply. In both cases, the tool (rubber grip/towel or machine) reduces the effort needed to accomplish the task by either increasing your grip or changing the force direction, showing how machines simplify tasks by amplifying human effort.
Practice Version
Machine: A device that makes work easier by changing the size or direction or both of a force. Machine. A machine is something that helps us do things more easily, like lifting a heavy box.