初二物理重点记录(国外英文资料).doc

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初二物理重点记录(国外英文资料)

初二物理重点记录(国外英文资料) In physics, the [1] force that acts vertically on the surface of an object is called pressure. Deformation occurs when all surfaces are subjected to pressure In physics, the ratio of the pressure on the object surface to the force area is P=F/S Solid pressure: when an object is deformed due to an external cause or within it, the two sides of any cross section of the body appear to interact with each other, and the force on the unit cross section is called stress. Generally speaking, for solids, in external forces Under the action, there will be compressive (or tensile) deformation and shear deformation. Therefore, to accurately describe these deformations of the solid, it is necessary to know the effect of the three components of force acting on its three mutually perpendicular planes. such The stress F/A has nine different components corresponding to each component of force Fx, Fy, Fz, and three perpendicular planes acting on Ax, Ay and Az. Therefore, stress is a tensor, strictly speaking. Related interpretation folding edit this paragraph Define fold A force in physics that forces the vertical acting on the surface of an object and points to the surface is called pressure. Pressure is the physical quantity that represents the magnitude of force on a unit area of an object. The standard atmospheric pressure is 1.013x10, (10 of the 5 sides) Pa. The atmospheric pressure is equivalent to the pressure generated by about 76cm of mercury column, which is the magnitude of atmospheric pressure. Physical meaning: pressure is the physical quantity that indicates the effect of pressure. Formula folding P=F/S (pressure, pressure = force area) P - pressure (unit: Pascal, symbol: Pa) F - pressure (unit: Newton, symbol: N) S - force area (unit: square meters, symbol: m) F=PS (pressure = pressure = force area) S=F/p (force = pressure / pressure area) (the magnitude of the pressure depends on the area of force and the magnitude of the pressure) II. P1V1=p2V2 Said t

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