You will be analyzing the hyrdrodynamics of different swimming strokes Lab Report

You will be analyzing the hyrdrodynamics of different swimming strokes - Lab Report Example The major purpose of this lab report was to analyze the hydrodynamics of different swimming strokes through considering several factors such as swim time, stroke frequency, stroke length and perceived effort, in the comparison process. From the results, scenario B assumes a shorter swim time and higher stroke frequency than in the case of scenario A. Further, the perceived effort used in B was less than that used in A. The reasons for the observed phenomena, depends on such factors like gravitational pull, friction force and outside pressure. When a swimmer is partially submerged, as shown in A, there is increase in atmospheric pressure and gravitational pull acting thereby resulting in reduced speed. Further, while partially submerged, some parts of the body remain exposed to the air thereby triggering action of friction force between swimmer’s body and air. At the same time, scenario A allows the subject to breath, which in turn reduces the stroke frequency because more time is spent in breathing. The situation is different to scenario B, where swimmer’s body is fully submerged in water leading to reduction in friction force, gravitational pull and atmospheric pressure acting. This triggers shorter swim time, higher stroke frequency and less perceived effort (Stager & Tanner, 2005). The results also manifest differences between scenario C and D, where dolphin kick was used for both with difference being one is submerged while the other is not. C, where full submergence was assumed, both swim time and perceived effort was less than D (not submerged. This can be attributed to the fact that dolphin kick becomes more effective when there is reduced friction and gravitational force through ensuring full submergence (Maglischo, 2003). The reduced forces leads to less perceived efforts and swim time as observed in scenario C. For situation D, more force is allowed to act on the swimmer in addition to efforts spent on breathing