Kinesiology 2241A/B Lecture Notes - Lecture 28: Backstroke, Parasitic Drag

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2241A/B
• Professor: Thomas Richard Jenkyn

Document Summary

Kinesiology 2241b lecture 28: hydrodynamics in sport i. When immersed in water, the body feels a buoyancy force pushing the body upward. When the buoyancy force is larger than the gravitational force pulling you down, you float. The buoyancy force is determined by the amount of water you displace and the difference between your density and the water density. Density is mass divided by volume, so the units are kg/l 3. Weight density (wd) is weight divided by volume, so the units are n/l 3. The wd of fresh water is 9. 8 n/l 3 and for sea water is 10. 1 n/l 3. The body is made up of several different types of tissue that each have different weight densities. The proportion of each type of tissue in your body determines how buoyant you are. The amount of air in your body is under your control breathe out, less air, breathe in, more air.