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IMPORTANT KEY POINTS OF MCAT PHYSICS UNIIT:- FLUID DYNAMICS 1:-Fluid may be gases or liquids. 2:-Work done by drag force is negative. 3:-Viscosity of liquids decreases with rise of temperature . 4:-Viscosity of gases increases with rise of temperature. 5:-Mechanics is concerned with motion of the bodies under the action of forces. 6:-When a body is moving with terminal velocity then it has zero acceleration. 7:-At terminal velocity fluid friction is maximum. 8:-At terminal velocity the net force acting on the body is zero. 9:-Terminal velocity of the body is directly proportional to its mass & density. 10:-Strokes law holds good for objects having spherical symmetry. 11:-Ideal fluid is also ir-rotational so it has zero angular momentum. 12:- Above critical velocity flow is turbulent. 13:-Venturi’s meter is used to check the type of fluid flow & measure the speed of fluid. 14:-Systolic pressure is the maximum value of normal blood pressure. 15:-With the passage of time flexibility of blood vessels decreases. 16:-Flow rate remains same at every point & every where. 17:-Coefficient of viscosity does not depends upon pressure & density of fluid & does depends upon nature & temperature of fluid. 18:-Product of pressure & time is viscosity & its unit is poise & pascal second. 19:-Viscosity of liquids is due to type of frictional forces which are cohesive forces. 20:-For aged person value of systolic & diastolic pressure in increased. 21:-By increasing the pressure of fluid density of fluid also increases. As P= 𝟏 𝟑 28:- Bernoulli’s equation is a special case of Euler’s equation. 29:- Viscous flow of a fluig is also called poiseuille flow. 30:- Founder of modern fluid dynamics are Ludwig Prandtl & G.I Taylor. 31:- Fluid mechanics is the branch of science which is concerned with moving & stationary fluids. 32:- Ratio of dynamic viscosity to density is called kinematic viscosity. & its unit is m 2sec-1. 33:- Ball pen functions on the principle of surface tension. 34:-The magnitude of tensile force that acts per unit length is called surface tension. 35:-Fluid motion leading to circular or nearly circular streamlines is called vortex motion. 36:-Kinematic viscosity sometimes also called momentum diffusivity. 37:- The radius of aorta is 10mm & blood flowing through it has a speed of 300 mm/sec. 38:- A Capillary has a radius of 4×10-3 mm & speed of blood flowing through it is 5×10-4 m/sec. 39:- Diastolic pressure is the minimum value of normal blood pressure. 40:- Graph b/w surface tension & temperature is given below. Surface tension Temperature 41:- At systolic pressure flow of fluid is turbulent & flow is laminar at diastolic pressure 42:- Graph (1) b/w velocity & time when object is thrown upward with velocity V, (2) B/w height (h) to which liquid rise in tube & radius of capillary tube . V2 22:-Speed of fluid is maximum in venturimeter at converging duct. 23:-Fluid dynamics is further divided into two categories , V i.e. Aerodynamics & Hydrodynamics 24:-The study of fluid at rest is called hydrostatics. 25:-A fluid motion in term of position of entire particle is called Lagrangian Specification. o 26:-The path followed by a fluid element is called particle path or flow line. 27:-According to Archimedes Principle , whatever the shape of body ,the net force is an upthrust & is equal to g times the mass of fluid displaced by the body which is weight of body. (h) Height where, h is given by formula 𝟐𝑻𝒄𝒐𝒔 => h = where,T is tension. 𝒓𝒈 Time Radius of tube Graph (1) Graph (2) BY:- YASIR MUKHTAR ………………………………………………...<STUDENT OF MCAT>……………………………………………………………………… Page 1