Your lesson plan on Industrial Revolution concepts should show students why Henry Ford thought an assembly line made better, faster products. That's what this activity should prove, too.
Once students have made individual burgers, now they are assigned a job on the assembly line. If you have a large class, you can have two assembly lines. The line starts with opening the cookie packages, placing a paper plate down, putting the bottom bun on the plate, and so on. Each task in building the burger is a new job for an individual student. Once students have made about 10 burgers, you can time how long it takes to make a burger on the line. Do students notice that some jobs take longer than others? What happens if someone is really slow or too fast? Is it easy to do one particular job on the line or easier to make the whole burger alone? These are the questions you want students to ponder and write about after their experience. Ask them to relate their in-class project to Ford's idea of making cars on the assembly line.