Viscosity
The measure of the resistance of a fluid to flow is known as viscosity. Most fluids have some resistance to motion, the resistance provided by the fluid is called viscosity. This resistance is created by the force of attraction between the fluid molecules. If you pour water through a funnel, it flows easily and quickly, because it has very little resistance. But if you pour honey through a funnel, it may take a little time longer, as the density of honey is high.
Poiseuille's Law
The law of Poiseuille or Poiseuille's equation states that the pressure drop of an incompressible fluid especially a liquid in a laminar flow that passes through a cylindrical tube of length L, radius r, pressure gradient ΔP, and mainly depends on the viscosity of the fluid is nothing but the pressure difference of the layers of fluids. ΔP=P1-P2
Drag Forces
Forces that occur due to the movement of fluid are known as fluid mechanics. Following are the fluids present:
The air around the spinning baseball in the figure experiences a faster speed on the left than the right side and hence a smaller pressure on the left than the right. Suppose the ball is traveling in the x -direction at 38.0 m/s and it breaks 15.0 cm to the left in the -y -direction. Determine the pressure difference between the right and left sides of the ball. Assume the ball has a mass of 142 g and a radius of 3.55 cm. In addition, assume it travels at a constant speed of 38 m/s in the x -direction from the pitcher’s mound to home plate (60.5 ft = 18.44 m). Hint: The pressure difference equals the leftward force multiplied by the crosssectional area of the ball, πr^2.
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