Frictional resistance of streamline flow vs. turbulent flow - the frictional resistance due to turbulent flow is greater than that due to streamline flow. BUT if you double the speed of movement of the water, you increase your resistance by 2. Turbulent Flow - the resistance of the water to movement is proportional to the square of the velocity of movement. If you double the speed of movement of the water, you will square the resistance. Formation of wakes and eddies - when an object moves through the water, a difference in the water pressure develops between the front and the back of the object.
Pressure builds up on front of the object and decreases in the rear of the object.
This results in a flow of water into the lower pressure areas behind the object. This flow of water is known as a wake. An object will move form an area of greater pressure to an area of lower pressure. Change in direction of movement 4. Unstreamlined - broad, flat, irregularly shaped object with larger surface area in contact with the water and therefore the greater the resistance to movement.