💨 AERODYNAMIC DRAG
PAGE 1 OF 5, THE INVISIBLE WALL
PUSHING THROUGH AIR
WHAT IS AERODYNAMIC DRAG?
Hold your hand out of a car window and you feel air pushing back. That push is aerodynamic drag: a force from the fluid (air) that resists motion through it. Drag always acts opposite to the direction of travel. A cyclist, a jet, and a falling feather all fight drag. Even though air seems empty, it has mass and it must be pushed aside as you move. The faster you go, the harder the air pushes back. Engineers call drag an invisible wall because you cannot see it, yet it limits top speed, burns extra fuel, and shapes every fast vehicle on Earth.
💨 DRAG RULE
Drag force always points opposite to the direction of motion. It slows things down unless another force (like an engine) keeps pushing forward.
PUSH!
OPPOSES MOTION
⬅️ Drag points backward
➡️ Thrust or pedalling pushes forward
⚖️ Net force decides acceleration
➡️ Thrust or pedalling pushes forward
⚖️ Net force decides acceleration
EVERYWHERE IN AIR
🚴 Bikes, balls, and birds feel drag
🌊 Same idea works in water too
🏁 Speed records depend on beating it
🌊 Same idea works in water too
🏁 Speed records depend on beating it