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Learners use a spring scale to drag an object such as a ceramic coffee cup along a table top or the floor.

Learners initially test to see how many drops of liquid (water, rubbing alcohol, and vegetable oil) can fit on a penny.

Learners work in groups to design and build a tower out of balsa wood. As a motivator, they can compete to build a tower with the highest strength-to-weight ratio.

Each learner chews a piece of gum until it loses its flavor, and then leaves the gum to dry for several days.