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2241A/B (500)
Lecture 24

Kinesiology 2241A/B Lecture 24: Lec. 24 Human Movement in a Fluid Medium


Department
Kinesiology
Course Code
Kinesiology 2241A/B
Professor
Michael Agnew
Lecture
24

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Lec. 24 Human Movement in a Fluid Medium
Fluids;
- Do not resist deformation (slightly with viscosity)
- Ability to flow
- Inability to support shear stress in static equilibrium
Properties
1. Density
2. Specific weight
3. Viscosity
Nature of Fluids
- Head wind: Force against the motion of the cyclist, forcing them to travel
faster to obtain a desired speed
- Tail wind: Force favoring the motion of the cyclist, means they do not
have to work as hard to obtain a specific velocity due to the pushing from
the wind
If the wind force is 2m/s, then the winner of the cycling marathon
is not accredited due to the tail wind

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- Smaller relative velocity = less drag
- Larger relative velocity = more drag
- Side wind: If the wind blows laterally, than there is a lateral component
to the velocity, so the drag force is angled relative to the objects pathway

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Laminar vs Turbulent Flow
Laminar
Turbulent
No mixing between layers
Mixing of layers
Phenomenon of Goosebumps
- The hair follicles pop upwards creating a rough surface for the air flow,
which creates turbulent air flow
- Turbulent air flow creates pockets for convection, making an insulative
layer
Buoyancy
- Vertical force, always acts upwards
- Archimedes Principle: Buoyant force = Weight of displaced fluid
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