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Mechanics

Continuity equation Fluid Mechanics

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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Terminal Velocity formula

What is Terminal Velocity? “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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Elastic and Inelastic Collision

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 density measurement

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 a ...

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what is pressure in physics

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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Turning effect of forces

How to find torque? “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. Rigid body: ...

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what does Equilibrium mean

What is equilibrium? “A body is said to be in equilibrium if no net force acts on it.”Newton’s first law of motion tells us that a body continues its state of rest or of uniform motion in a straight line if no resultant or net force acts on it.For example,a book lying on a table or a picture hanging on ...

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Work energy and power problems and solutions

What is work? “Work is a task or job  done when a force acts on a body and moves it in the direction of the force.”Generally ,it refers to perform some task or job. How to find work in physics? In science ,work has precise meaning.For example,a man carrying a load is doing work but he is not doing work ...

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alternative renewable energy

What is solar energy? “Solar energy is the energy coming from the sun and is used directly and indirectly.”The earth receives huge amount of energy directly from the sun each day.Solar energy at normal incidence outside the earth’s atmosphere is about 1.4 kWm-2 which is referred as solar constant.While passing through the atmosphere,the total energy is reduced due to reflection,scattering ...

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Satellite

 What is satellite? Any heavenly body that moves around a planet s called a satellite. The Moon is a natural satellite of the Earth that orbits the Earth. Mars, Jupiter,Saturn,Uranus and Neptune have their own satellites too. Natural Satellites: Beside moons of the planets, some other natural satellites are also moving around the Sun. These are asteroids, comets and meteoroids. ...

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