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Mechanics

Viscosity of fluids and Poiseuille’s law with applications

What is Viscosity? “Viscosity is the  internal friction in a fluid.”Viscous forces opposes the motion of one portion of a fluid relative to another.Viscosity is the reason it takes effort to paddle a canoe through calm water,but it is also the reason the paddle works.Viscous effects are important in the flow of fluids in pipes,the flow of blood,the lubrication of ...

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Work energy theorem derivation:examples and problems

Work kinetic energy theorem Work energy theorem states that:“The net work done by the forces acting on the body is equal to the change in kinetic energy of the body.”Mathematically it is expressed as: Work energy theorem formula Wnet = Kf –Ki = ∆k An unbalanced force applied to a particle will certainly change the particle’s state of motion.Newton’s second law provides ...

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kepler’s laws of planetary motion definition and equation

What are kepler’s three laws of planetary motion? Using newton’s laws of motion and law of universal gravitation,we can understand and analyze the behavior of all the bodies in the solar system:the orbits of the planets and comets about the sun and of natural and artificial satellites about their planets.We make two assumption that simplify the analysis: We consider the ...

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Bernoulli equation:Definition,derivation with applications in fluid mechanics

Bernoulli equation fluid mechanics Bernoulli’s equation is defined as:”The sum of pressure,the kinetic and potential energies per unit volume in a steady flow of an in compressible and non viscous fluid remains constant at every point of its path.”Mathematically it is expressed as: Bernoulli’s principle formula P+ ρgh +1/2 ρv2 =constant Bernoulli’s equation,which is a fundamental relation in fluid mechanics,is not a ...

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Continuity equation derivation in fluid mechanics with applications

General Concept of Fluid Flow One way of describing the motion of a fluid is to divide the fluid into infinitesimal volume elements,which we may call fluid particles,and to follow the motion of each particle. If we knew the forces acting on each fluid particle,we could then solve for the coordinates and velocities of each particle as functions of the ...

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Stokes law terminal velocity formula

Terminal Velocity definition physics “When a magnitude of the drag force becomes equal to the weight,the acting force acting on the droplet is zero. Then the droplet will fall with constant speed called terminal velocity.” Before we going to discuss terminal velocity,we will first shortly explain viscosity and Stokes law. What is viscosity? “The fractional effect between different layers of ...

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Difference between elastic and inelastic collision with examples

What is a Collision? In a collision a relatively large force acts on each colliding particle for a relatively short time. The basic idea of a collision is that the motion of the colliding particles (or of at least one of them) changes rather abruptly and that we can make a relatively clean separation of time that are “before the ...

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Archimedes principle formula and law of floatation with applications

State Archimedes Principle When an object is totally or partially immersed in a liquid, an upthrust acts on it equal to the weight of the liquid it displaces. An air filled balloon immediately shoots up to the surface when released under water. The same would happen if a piece of wood is released under water. We might have noticed that ...

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difference between pressure and force

What is Pressure? “The force acting normally per unit area on the surface of a body is called pressure”. Press a pencil from its ends between the palms. The palm pressing the tip feels much more pain than the palm pressing its blunt end. We can push a drawing pin into a wooden board by pressing it by our thumb. ...

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Torque in physics definition formula examples and applications

Definition of torque in physics “The turning effect of a force is called torque or moment of the force.” We open or close a door by pushing or pulling it.Here push or pull turn the door about its hinge or axis of rotation.The door is opened or closed due to the turning effect of the force acting on it. Before ...

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