Wind Resistance
Wind resistance is the push air makes against things that move through it or stand in its path.
Hold your hand flat over a bowl of flour and sweep it sideways fast. The flour puffs up and pushes back against your hand. The faster you move, the stronger that push feels. That push is wind resistance — air pressing back on anything that moves through it.
Explaining wind resistance by grade level
Wind pushes on buildings. A round tower lets wind slide past. A flat wall catches more wind and can tip over. Shape matters when wind blows hard.
Projects that explore wind resistance
Wind resistance grows when a surface shows more area to the air. A flat wall catches more push from the wind than an open frame. In one test, the open-sided bridge tilts only 3 degrees. The fully covered bridge tilts 37 degrees, showing more surface means more force from the wind.
Wind resistance depends not only on surface area but also on shape, because shape controls how air flows around an object and how much push it absorbs. A curved surface lets air slide past with less force, while a flat face catches the full push of the moving air. In one wind-tunnel experiment, the rectangular model topples at the lowest wind speed whereas the circular model withstands the highest speed before collapsing, demonstrating that rounded cross-sections reduce the air's push significantly.