Human Swimming - Physics

Physics

Swimming relies on the natural buoyancy of the human body, with the relative density of the average body, compared to water, of 0.98, creating a floating effect. This varies on the basis of body composition, with body fat lowering the density, and increasing floatation.

The relative density difference means that water supports the body during swimming, and therefore makes swimming low impact compared to surface activities such as running where weight is put on to the joints, and also creates resistance when moving through the water. The resistance is used by swimming strokes to create propulsion, but creates drag on the body.

This means that hydrodynamics are an important factor in stroke technique in terms of swimming faster, and swimmers wishing to swim faster, or wishing to tire less will try and reduce the drag caused by the body through the water. In order to be more hydrodynamic, people can increase the power of the strokes, or reduce water resistance, although increasing power to overcome resistance needs to increase by a factor of three to achieve the same effect as reducing resistance.

Efficient swimming by reducing water resistance involves having a horizontal water position, rolling the body in order to reduce the breadth of the body in the water and extending the arms as far as possible in order to reduce wave resistance.

Read more about this topic:  Human Swimming

Other articles related to "physics":

Indeterminism - Science - Classical and Relativistic Physics
... The idea that Newtonian physics proved causal determinism was highly influential in the early modern period ... For instance, Newtonian physics admits solutions where particles accelerate continuously, heading out towards infinity ...
Institute For Theoretical And Experimental Physics
... The Institute for Theoretical and Experimental Physics (ITEP Russian Институт теоретической и экспериментальной физики) is. 1945, ITEP exists as a community of people studying topics ranging from theoretical physics and mathematics to biology and chemistry ... Research areas in theoretical physics concentrate around quantum field theory including the string theory ...
Information - As A Property in Physics
... Information has a well-defined meaning in physics ... Bekenstein claimed that a growing trend in physics was to define the physical world as being made of information itself (and thus information is defined in this way) (see Digital physics) ...
Whistled Language - Physics
... In a non-tonal language, segments may be differentiated as follows Vowels are replaced by a set of relative pitch ranges generally tracking the f2 formant of spoken language ... Stress is expressed by higher pitch or increased length Consonants are produced by pitch transitions of different lengths and height, plus the presence or absence of occlusion ...
Physics - Current Research
... Further information List of unsolved problems in physics Research in physics is continually progressing on a large number of fronts ... In condensed matter physics, an important unsolved theoretical problem is that of high-temperature superconductivity ... In particle physics, the first pieces of experimental evidence for physics beyond the Standard Model have begun to appear ...

Famous quotes containing the word physics:

    We must be physicists in order ... to be creative since so far codes of values and ideals have been constructed in ignorance of physics or even in contradiction to physics.
    Friedrich Nietzsche (1844–1900)

    He who is conversant with the supernal powers will not worship these inferior deities of the wind, waves, tide, and sunshine. But we would not disparage the importance of such calculations as we have described. They are truths in physics because they are true in ethics.
    Henry David Thoreau (1817–1862)

    Mathematics should be mixed not only with physics but with ethics.
    Henry David Thoreau (1817–1862)