Pressure refers to the ratio of force to the area over which the force is applied.
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Pressure is force per unit area.
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Pressure plays an important role in the behavior of fluids. As we have seen in this chapter, pressure is the magnitude of the force acting perpendicular to a surface divided by the area of the surface. Pressure should not be confused, however, with the force itself. Problem 106 serves to emphasize that pressure and force are different concepts. Problem 107 focuses on the essence of Archimedes' principle and its application to the situation of a buoyant force acting on a submerged object. The figure shows a rear view of a loaded two-wheeled wheelbarrow on a horizontal surface. It has balloon tires and a weight $W=$ $684 \mathrm{N},$ which is uniformly distributed. The left tire has a contact area with the ground of $A_{\mathrm{L}}=6.6 \times 10^{-4} \mathrm{m}^{2},$ whereas the right tire is underinflated and has a contact area of $A_{R}=9.9 \times 10^{-4} \mathrm{m}^{2} .$ Concepts: (i) Force is a vector. Therefore both a direction and a magnitude are needed to specify it. Are both a direction and magnitude needed to specify a pressure? (ii) How is the force each tire applies to the ground related to the force the ground applies to each tire? (iii) Do the left and right tires apply the same force to the ground? Explain. (iv) Do the left and right tires apply the same pressure to the ground? Calculations: Find the force and pressure that each tire applies to the ground.
How is pressure related to area?
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