In Lego class 2nd and 3rd graders have been learning about simple and powered machines using hands-on activities.
First, they investigated structures and forces, incorporating both rigid and flexible shapes in building deck chairs and drawbridges.
Applying principles they learned about levers, they made drumming machines. Attaching a motor provided more opportunities to explore. For example, the students predicted how many times the drumming machines would tap in a minute and then tested them. They each came up with quite varied predictions, but they found the actual counts were very similar. They also innovated, adding pieces to change the tapping pattern. Next they explored the use of levers in making windshield wipers. When they motorized them, after observing the wipers move in parallel motion, they had them clap together. Again, they predicted the number of claps in a minute and then counted the actual number.
The students have just started exploring wheels and axles. They are building a vehicle with a flywheel. Changes, such as wheel size and attaching a motor, will provide opportunities for measuring and comparing distance traveled, speed, and climbing ability. Undoubtedly, they will have their own ideas of how to alter the vehicles as well.
Although the children work hard in Lego class, it mostly feels like play.