Not so simple machine
This week, the CHA 4th graders learned about the six fundamental simple machines: (1) the inclined plane, (2) the wedge, (3) the screw, (4) the lever, (5) the wheel and axle, and (6) the pulley. They were challenged to identify the type of simple machine(s) found in everyday tools such as a screw driver. We learned that any mechanical device is made up of one or more of these simple machines. For example, a bike is a conglomeration of wheels and axles, pulleys, and levers. In fact, any mechanism that is made of more than one simple machine is by definition a complex (or compound) machine. We noted that “complex” does not automatically mean “complicated;” an axe is a complex machine because it is a wedge plus a lever, but no one would claim that an axe is a complicated mechanical device.
We took what we learned about simple machines and used a combination of simple machines to design and build two-step Rube Goldberg devices designed to ring a bell. Teams used supplies provided by the Scientists along with their own desks to create some crazy, bell-ringing machines! Although we ran out of time to complete the designs (building a working Rube Goldberg device is NOT an easy task!), the students did a great job presenting their design ideas and explaining how they would work! Be sure to look up more examples of awesome Rube Goldberg devices online and make your own at home!
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