Biomechanics of Swimming: Drag Flashcards
1
Q
Define drag
A
- force exerted in opposite direction to movement
2
Q
What are the 2 types of pressure drag?
A
- form
- vortex
3
Q
Define form drag. Where does this occur on the fish
A
- displacement of cross sectional area
- head of fish
4
Q
Define vortex drag. Where does this occur on the fish?
A
- pull back by vortices (TURBULENCE)
- tail of fish
5
Q
Define frictional drag. Where does it occur on the fish?
A
- water molecules sticking to the body surface “carpet burn”
- along body
6
Q
What are the solutions for minimizing form drag? (3)
A
- streamlining
- fusiform
- hydrodynamic
7
Q
What are the solutions for minimizing frictional drag? (2)
A
- mucus + scales
- fin size/shape
8
Q
What flips vortex drag?
A
- tail beating
- pushes forward (recoil)
9
Q
What does a tail bend do?
A
- flicks vortices to opposite side
10
Q
Vortices pushed away = _____ = pushes fish fwd
A
- recoil
11
Q
Define drag
A
- force exerted in opposite direction to movement
12
Q
What are the 3 types of drag?
A
- form
- frictional
- vortex
13
Q
What are inertial forces?
A
- tendency of mass to remain at rest or keep moving unless acted upon by outside force (thrust)
14
Q
Thrust > drag = ?
A
- fish moves fwd
