Engineer - Rubberbands

Rubberband Strength
One of the requirements for an engineer is to make a catapult. This requires the use of a rubber band or two or a piece of tire inner tube. The rubber band is "elastic" and it stretches, but then returns to its original shape. Before using materials in the building, engineers must know the characteristics. Does it expand or contract? Is it weak or strong? Does it burn or not?

You can try an experiment to learn more of the characteristics of rubber bands and other elastic materials. Get a collection of different-sized rubber bands. Measure them for length, width, and thickness (if you can). Make a chart that shows this information and mark each rubber band clearly so you know which is which. (Using colored rubberbands is best.)

Rubberband Original Stretched
Length Width Thickness Length Width Thickness

With each rubber band, attach one end to a cup hook that is screwed into a board. Attach the other end to a known weight. How far down does each rubber band stretch? Does its thickness change? Does its width change? Which rubberband is the strongest? Which rubberband is the weakest? How can you tell?

Data supplied by Pack 114


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