Note 2 — Front matter
Reading edition
For a given shape and density of material, the smaller an object the higher the proportionate resistance it offers to the air. This is because, in relation to its bulk, a small object has a greater surface area than a large one. Hence, relatively more friction. Thus, in air, a mouse might be expected to fall slightly slower than a man.
But this is not the most important reason why small objects are not as easily damaged by proportionate forces as large objects. Take the model of an ocean liner. It seems very firm and rigid. Build a full-size ship under the same specifications—same steel, same relative thicknesses and lengths. If it was possible to pick such a ship up from either end, it would be in danger of breaking in two under its own weight!
Small objects are relatively stronger. In order to make a full-size ship as strong as its model, the strength of the materials used would have to be increased in proportion.—Ed.