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Morphology & Locomotion
n/a
14
Science
Undergraduate 4
02/05/2012

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Cards

Term
cetceans?
Definition
whales, dophins, porpoises, otters
Term
pinnipids?
Definition
true seals (phocid)
fur seals (othriid)
walrus (Odobenidae)
Term
Sirenians?
Definition
manatees (Trichechidae)
Dugongs (Dugongidae)
Term
size is ______?
Definition
size is...
not correlated to the speed of the animal
Term
What is drag?
Definition
drag is the rate of removal of momentum from a moving body immersed in a fluid
Term
Reduction of Drag
Definition
P=Du

P=power output
D=drag
u=speed
Term
3 types of Drag?
Definition
1.Viscous Drag or Skin Friction
2.Pressure Drag
3.Wave Drag
Term
Viscous Drag or Skin Friction
Definition
effects felt in boundary layer (close to body suface)
Term
Pressure Drag
Definition
*Proportional to surface area & the sq area of speed
*Body creates a low pressure wake behind it
Term
Wave Drag
Definition
*kinetic energy transformed into potential enegry in the waves
*Reaches a maximums at a depth of 0.5 body diameter
Term
Thin layer of fluid whose velocity is affected by the body surface (fluid in boundry layer does not move relative to body surface)
Definition
Boundary layer
Term
occurs dues to the friction of the fluid against the body surface
Definition
viscous drag
Term
small-->
Definition
higher surface area to volume ratio
(better!)
Term
why do dolphins shed their skin every 2 hours?
Definition
they are "bare skinned cetaceans" because of their epidermal cell
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