ESS 303 – Biomechanics Hydro- and Aerodynamics. Air & Water Resistance Drag force Opposite direction of movement through medium Depends on coefficient.

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Presentation transcript:

ESS 303 – Biomechanics Hydro- and Aerodynamics

Air & Water Resistance Drag force Opposite direction of movement through medium Depends on coefficient of friction for the surrounding medium Types of drag Skin friction (surface drag) Profile drag (based on an object/person’s shape) Wave drag (air-water interference – think of splashing)

Skin Friction

Profile Drag

Wave Drag

Propulsive force in swimming Flat hand in stroke Tilted hand when treading water Making Drag Work For You

Lift force Pressure inversely proportional to velocity Bernoulli’s Principle Lift

Magnus Effect Ball’s Motion Low Velocity (High Pressure) High Velocity (Low Pressure)

Magnus Effect

Center of Buoyancy Different from center of mass (COM) or center of gravity (CG) Effects body and appendage position when floating CG CB

Angle of Attack Zero angle of attack, zero lift force, minimum drag force Small angle of attack, high lift force, small drag force High angle of attack, small lift force, large drag force

Terminal Velocity Force from the acceleration of gravity countered by air-friction force Air Friction Acceleration of Gravity

Terminal Velocity

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