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Author Archives: admin

Speed : Definition,formula,unit and examples

Speed Velocity Acceleration What is speed in physics? “The distance covered by an object in unit time is called its speed”.In other words, the rate at which object is moving is called speed.Unit time may be a second, an hour, a day or a year.It tells us how fast or slow an object is moving.Its formula is given as: Here ...

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Renewable energy sources list

“Renewable energy sources are those energy sources that can be regenerated quickly.”There are many sources of energy such as coal,oil and natural gas.These fuels are called fossil fuels.These fuels would not last forever.They are not recoverable.These sources are called non renewable energy sources. List of some renewable sources of energy Energy from tides Energy from waves energy from sun energy ...

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what are the different types of sources of energy?

 “Energy is the ability of a body to do work.”It is  present everywhere in sunlight,water,wind,plants,animals etc..It is required for walking, reading and playing.Energy does makes things for us like makes toast,plays music etc..A good source of energy would be the one which would: Do a large amount of work per unit volume or mass. Be easily be accessible Be easy ...

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Kinetic energy examples in every day life

Kinetic energy is defined as ” The energy possessed by an object due to its motion.”It derived from the Greek word kinetikos which mean motion.It depends on the mass and velocity of an object.Mathematically it is expressed as: where m is the mass of the body moving with velocity v . unit of kinetic energy is joule. if the mass ...

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types of motion in physics with examples and pictures in daily life

What does motion mean? “A body is said to be in motion,if it changes its position with respect to its surroundings.” Surroundings are the places in its neighborhood where various objects are present.The state of rest or motion of a body is relative.For example,a passenger sitting in a moving bus is at rest because he is not changing his position ...

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Second law of thermodynamics:Statement,examples and applications

Second law of thermodynamics states that heat can flow spontaneously from a hot object to a cold object; heat will not flow spontaneously from a cold object to a hot object. Why we need  2nd law of thermodynamics? The first law of thermodynamics  would not be violated if any of these processes occurred in reverse. To explain this lack of reversibility ...

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Internal energy formula physics and examples

“The sum of all forms of molecular energies (kinetic and potential ) of a substance is termed as its internal energy.”In the study of thermodynamics,usually ideal gas is considered as a working substance. the molecules of an ideal gas are mere mass points which exert no force on one another. so the internal energy of an ideal gas system is ...

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Evaporation and boiling

If you are moping the floor in home you will observe that the wet floor or surface of floor becomes dry very early after a while.We can say that thin layer of water on floor surface has evaporated.Evaporation is the change the change of state of liquid into vapours. Evaporation is different from boiling besides this in both processes evaporation ...

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Radiation heat transfer examples

Radiation heat transfer is the mode of transfer of heat from one place to another in the form of waves called electromagnetic waves.Convection and conduction require the presence of matter as a medium to carry the heat from the hotter to the colder region. But a third type of heat transfer occurs without any medium at all. All life on Earth ...

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convection heat transfer : Definition,Examples and Applications

Radiation of heat Conduction of heat Convection of heat definition “Transfer of heat by actual movement of molecules from hot place to a cold place is known as convection.” Liquids and gases are poor conductors of heat.However,heat is transfer through  fluids(liquids or gases)easily by another method called convection. Why a balloon inflated with hot shown in figure .rise up?a liquid ...

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