What transparent object, found in many households, becomes less transparent when wiped with a clean cloth?
Balloon Behavior
A child sits in the back seat of the family car, holding a helium balloon on a string. All the windows are closed. As the car accelerates forward, does the balloon tilt forward, tilt backwards, or remain in the same place?
Iron Doughnut
A piece of solid iron in the shape of a doughnut is heated over a fire. As the iron expands, does the hole become larger or smaller or does it remain the same size?
Bootstrap Elevator
Study the drawing carefully. Can the man lift both himself and the block off the ground?
Sunken Sub
The captain of a submarine tries at all costs to avoid letting his sub come to rest on a clay or sandy ocean bottom. He knows that if this happens, it can be fatal. Why?
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