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The 39 pages that link to Drag, each with the reason it gives.

• AerodynamicsRelated: Pressure differences and viscous shear create resistance to motion.

• Aquatic locomotionRelated: Body shape and speed determine how much water resists locomotion.

• Bird flightRelated: Birds adjust posture and wing shape to limit this resistance.

• Fish locomotionRelated: Fish body shape and swimming speed determine the resistance they must overcome.

• Lift (force)Compared with: Drag acts along the flow direction, while lift is defined perpendicular to it.

• ThrustRelated: Thrust must balance drag for steady speed or exceed it for acceleration.

• SwimmingRelated: Swimmers reduce drag by streamlining their bodies and controlling their movements.

• AirfoilRelated: Airfoil design balances lift against drag produced by pressure and viscosity.

• Wind tunnelRelated: Measured drag reveals the resistance an object encounters in airflow.

• Insect flightRelated: Wing shape and stroke timing affect the resistance insects encounter in flight.

• Gliding flightRelated: Drag reduces forward speed and limits the distance covered in a glide.

• Swing bowlingRelated: Differences in airflow and separation around the ball are central to explaining swing.

• Freestyle swimmingNarrower topic: Reducing water resistance is central to sustaining speed in freestyle.

• InertiaCompared with: Drag changes motion; inertia is the tendency for motion to persist.

• Soaring flightRelated: Birds must limit drag to make the most of weak or intermittent updrafts.

• No-slip conditionRelated: No-slip creates near-surface shear that contributes to viscous drag.

• FlipperRelated: Flipper shape balances thrust against resistance as it moves through water.

• Magnus effectCompared with: Drag acts along the flow direction, unlike the Magnus effect's transverse force.

• Powered flightCompared with: Wing-generated thrust must overcome drag to sustain forward flight.

• Aerodynamic liftCompared with: Drag acts along the airflow direction, unlike lift, which acts perpendicular to it.

• AircraftRelated: Aircraft design limits drag to improve speed and efficiency.

• Muzzle velocityRelated: Drag reduces projectile speed after it leaves the muzzle.

• PropellerRelated: Blade drag consumes power and limits propeller efficiency.

• George CayleyRelated: Cayley treated drag as a separate aerodynamic force that a flying machine must overcome.

• StreamliningNarrower topic: Streamlining aims to reduce this force.

• Cetacean locomotionRelated: Cetacean body shape and surface features affect resistance during swimming.

• Contact forceBroader topic: Fluid molecules transfer momentum through contact with the object's surface.

• Jet aircraftRelated: Reducing drag improves a jet aircraft's speed, range, and fuel economy.

• Radial engineRelated: The radial engine’s large frontal area can increase aircraft drag.

• Webbed footRelated: Spreading the toes increases resistance against water during the power stroke.

• Fish finRelated: Fins can increase drag for braking or reduce it when streamlined against the body.

• Screw PropellerRelated: Blade drag consumes power and influences the balance between thrust and efficiency.

• ArrowRelated: Air resistance slows an arrow and makes its trajectory curve downward.

• Wing-propelled divingRelated: Streamlined bodies and folded feathers reduce the drag that otherwise raises swimming costs.

• AirplaneRelated: Airplane design balances drag against the lift and speed needed for flight.

• Resultant forceRelated: Combining drag with propulsion or gravity determines the net motion.

• Cyclonic separationRelated: Fluid drag resists the outward migration of particles through the rotating flow.

• Animal finRelated: Fin area and posture affect the drag animals face while swimming.

• Franz ReicheltRelated: A parachute must generate enough drag to counter a falling person's weight.