Additionally, the swimmer expends unnecessary energy in pushing the water backwards, giving it kinetic energy that could have been used more efficiently. This friction is associated with the development of boundary layers. Frictional drag comes from friction between the fluid and the surfaces over which it is flowing.
![drag force drag force](https://image.slidesharecdn.com/dragforcelift-171111070936/95/drag-force-lift-5-638.jpg)
The force of drag in fact serves to hinder more than aid the swimmer, creating turbulence as high pressure builds behind the individual’s palm. Drag of Blunt Bodies and Streamlined Bodies A body moving through a fluid experiences a drag force, which is usually divided into two components: frictional drag, and pressure drag. This differential equation can be solved by separation of variables: v 0 v ( t) d v v 2 0 t c d A 2 m d t. However, this method of pulling was eventually proven ineffective and less energy efficient. First, assuming you have an object with mass m that has an initial velocity v 0 experiences this drag force, and no other forces. If the fluid is air, then it is called aerodynamic drag force. Coefficients are given for a number of geometrical shapes and also for cars, airships and struts. This type of drag force is an interesting consequence the. The velocity may be that of the object through the air (or any other gas) or the air velocity past a stationary object. Form drag, also known as pressure drag, arises because of the shape and size of the object.
![drag force drag force](http://www.batesville.k12.in.us/Physics/PhyNet/Mechanics/Newton2/Images/baseball_ar.gif)
Thereby utilizing Newton’s 3rd Law (for every action, there is an equal and opposite reaction), the swimmer would push back on the water and the water would consequently drive the swimmer forward. The force on an object by a fluid to resist its motion through it is called the drag force. The drag coefficient (non-dimensional drag) is equal to the drag force divided by the product of velocity pressure and frontal area. By pulling the hand straight back through the water, the drag force would occur in the opposite direction of this motion. For given air conditions, shape, and inclination of the object, we must determine a value for Cd to determine drag. Initially, it was believed that drag was actually the main force in assisting the swimmer’s pull. The drag equation states that drag D is equal to the drag coefficient Cd times the density r times half of the velocity V squared times the reference area A. One of the main components of efficient swimming is the pull, creating propulsion due to the arm strokes. For simplicity, this article will only focus on freestyle, although applications can be found in any of the four official strokes of swimming.
![drag force drag force](https://imagesvc.timeincapp.com/v3/fan/image?url=https://beyondtheflag.com/wp-content/uploads/getty-images/2016/04/871302802.jpeg)
The main battle against drag begins with the first arm stroke.