5/21/2023 0 Comments Cinematica sus formulasViscosity is the material property which relates the viscous stresses in a material to the rate of change of a deformation (the strain rate). For instance, in a fluid such as water the stresses which arise from shearing the fluid do not depend on the distance the fluid has been sheared rather, they depend on how quickly the shearing occurs. In other materials, stresses are present which can be attributed to the rate of change of the deformation over time. Stresses which can be attributed to the deformation of a material from some rest state are called elastic stresses. For instance, if the material were a simple spring, the answer would be given by Hooke's law, which says that the force experienced by a spring is proportional to the distance displaced from equilibrium. ![]() In materials science and engineering, one is often interested in understanding the forces or stresses involved in the deformation of a material. In a general parallel flow, the shear stress is proportional to the gradient of the velocity. A fluid that has zero viscosity is called ideal or inviscid. Zero viscosity (no resistance to shear stress) is observed only at very low temperatures in superfluids otherwise, the second law of thermodynamics requires all fluids to have positive viscosity. For example, the viscosity of a Newtonian fluid does not vary significantly with the rate of deformation. However, the dependence on some of these properties is negligible in certain cases. In general, viscosity depends on a fluid's state, such as its temperature, pressure, and rate of deformation. For a tube with a constant rate of flow, the strength of the compensating force is proportional to the fluid's viscosity. This is because a force is required to overcome the friction between the layers of the fluid which are in relative motion. ![]() Experiments show that some stress (such as a pressure difference between the two ends of the tube) is needed to sustain the flow. For instance, when a viscous fluid is forced through a tube, it flows more quickly near the tube's axis than near its walls. Viscosity quantifies the internal frictional force between adjacent layers of fluid that are in relative motion. For liquids, it corresponds to the informal concept of "thickness": for example, syrup has a higher viscosity than water. Sponsored by Readability-Score.The viscosity of a fluid is a measure of its resistance to deformation at a given rate. time N/A Change in velocity By leahboyd14 /leahboyd14/ Published 31st July, 2018. time Accele r ation Displa cement (change in position) Accele ration v. ![]() ¡Descarga Kinematics in One Direction Cheat Sheet y más Cheat Sheet en PDF de Cinemática solo en Docsity! Kinematics in One Direction Cheat Sheet by leahboyd14 via /49480/cs/16532/ Displa cement and Distance Disp lac eme nt- vector extending from object's initial position to its final position Dist ance- scalar quantity repres enting the actual path followed by an object Distance equals displa cement when the object travels in a straight line and does not reverse its direction Velocity and Speed Velo city- vector describing the rate of displa cement average velocity = displa cem ent /time Inst ant aneous veloci ty- velocity at a specific time Speed- scalar calcul ating the rate of distance average speed = distan ce/ time If an object travels in a straight line, then speed and velocity are interc han geable Accele ration Acce ler ati on- rate of change of velocity accel eration = change in veloci ty/ time Uniform accele rat ion- magnitude remains constant constant accele rat ion- magnitude and direction are constant If accele ration acts in the same direction as velocity: speed increases If accele ration acts in the opposite direction as velocity: speed decreases If accele ration acts perpen dic ularly to velocity: direction changes The accele ration of gravity is 10 m/s Kinematic Equations vf = vi + 2ax vf = vi + at x = vi*t + 0.5at v=x/t or x=vt Kinematic Graphs GRAPH SLOPE AREA Position (or distance) v.
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