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Topic: Conservation of energy


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  generic document for building HyperPhysics
The conservation of energy principle is one of the foundation principles of all science disciplines.
Conservation of Energy: the total energy of the system is constant.
Conservation of Momentum: the mass times the velocity of the center of mass is constant.
hyperphysics.phy-astr.gsu.edu /hbase/conser.html   (0 words)

  
  THE P ZONE - Conservation of energy
Examples are: the total energy of an isolated system remains consistent; energy cam be neither created nor destroyed; in the changing from one form to another, energy is always conserved.
Thus, even though energy may be changes from one form to another, energy is not lost from the system.
We often say that the total energy of the universe is conserved.
library.thinkquest.org /12632/work/conservation.html   (191 words)

  
 Scientific Forms of Energy: Stored Energy, Kinetic Energy, Chemical Energy, Conservation of Energy
Energy is found in different forms, such as light, heat, sound and motion.
The law of conservation of energy says that energy is neither created nor destroyed.
Energy changes form, but the total amount of energy in the universe stays the same.
www.eia.doe.gov /kids/energyfacts/science/formsofenergy.html   (931 words)

  
 The Physics Classroom
As kinetic energy is decreased (due to the object slowing down), the potential energy is increased (due to the stretch/compression of a spring or an increase in height above the earth).
Conservation of energy on a roller coaster ride means that the total amount of mechanical energy is the same at every location along the track.
While assumption that mechanical energy is conserved is an invalid assumption, it is a useful approximation which assists in the analysis of an otherwise complex motion.
www.physicsclassroom.com /Class/energy/U5L2bb.html   (1266 words)

  
 CATHOLIC ENCYCLOPEDIA: The Law of Conservation of Energy
Such energy, whilst existing in many forms, is considered especially in two generically distinct states known as kinetic energy, or energy of motion, and potential energy, or energy of position.
Potential energy, on the other hand, is exemplified by a wound-up spring, or by the bob of a pendulum when at its highest point; as the bob swings upwards its velocity and kinetic energy continuously diminish, whilst its potential energy is increasing.
Energy is also recognized in the heat of a furnace, or the fuel of the same, in explosives, in an electric current, in the radiations of the ether which illuminates and warms the earth.
www.newadvent.org /cathen/05422a.htm   (6215 words)

  
 Conservation of Energy
Energy is not concrete; it is not a material substance; it is given meaning through the calculation of numbers.
If we compare the kinetic energy of a typical world class sprinter to the gravitational potential energy of a similarly accomplished pole vaulter of equal mass, we find that the two numbers are not equal.
In the earlier years of the Olympics, energy was lost is the course of the vault; that is, the potential energy of a vaulter was always less than the kinetic energy of a sprinter.
hypertextbook.com /physics/mechanics/energy-conservation   (1190 words)

  
 Conservation of Energy
The conservation of energy is a fundamental concept of physics along with the conservation of mass and the conservation of momentum.
Energy can be converted from one form to another (potential energy can be converted to kinetic energy) but the total energy within the domain remains fixed.
Because we are considering a moving gas, we add the specific kinetic energy term to the internal energy on the left side.
www.grc.nasa.gov /WWW/K-12/airplane/thermo1f.html   (0 words)

  
 IUCN - The World Conservation Union
International attention to the energy crisis is heightening by the day.
We cover the energy chain from producers to consumers, rich to poor and low tech to high tech.
The world is facing twin energy-related threats: that of not having adequate and secure supplies of energy at affordable prices and that of environmental harm caused by consuming too much of it.
www.iucn.org   (218 words)

  
 Energy Transformation on a Roller Coaster
Potential energy - the energy of vertical position - is dependent upon the mass of the object and the height of the object.
Kinetic energy - the energy of motion - is dependent upon the mass of the object and the speed of the object.
The work-energy bar charts for the coaster car illustrate that the car's energy is transformed from potential to kinetic and vice versa; yet the total amount of mechanical energy remains the same during the course of the motion.
www.glenbrook.k12.il.us /gbssci/phys/mmedia/energy/ce.html   (931 words)

  
 Energy Conservation News - View Energy Conservation News Across the US
Energy Conservation News - Read the latest Energy Conservation News headlines in the US from this week.
Stay up-to-date on Energy Conservation News and other Industry News on bizjournals.com.
Energy Conservation News - View news headlines across various industries.
www.bizjournals.com /industries/industries/energy/energy_conservation   (0 words)

  
 Conservation of Energy
The discovery of the energy discrepancies is seen with hindsight as being step (1) in the establishment of a new form of energy, and the discovery of the neutrino was step (2).
Suppose we verify that a certain process, say the collision of two pool balls, conserves energy as measured in a certain frame of reference: the sum of the balls' kinetic energies before the collision is equal to their sum after the collision.
Conservation of energy is the most important and broadly applicable of all the laws of physics, more fundamental and general even than Newton's laws of motion.
www.lightandmatter.com /html_books/2cl/ch01/ch01.html   (7939 words)

  
 Energy -- Workshop 3
The law of conservation of energy states that energy cannot be created or destroyed.
The law of conservation of energy is an abstract expression of an observation that has been made over and over again in nature: a measurable quantity, which we call energy, is neither created nor destroyed in physical interactions.
This law is a useful and powerful tool since in most commonplace energy transformations, changes in mass are too small to measure, and so scientists know that energy that seems to be lost must actually still exist, perhaps in a different form, even if its existence is no longer obvious.
www.learner.org /channel/workshops/energy/workshop3/icon3.html   (252 words)

  
 Ministry of Commerce, Science and Technology
The Solar Energy Laboratory was established in the mid-1980s out of a USAID/GOJ renewable energy project that involved assistance to a number of GOJ agencies to improve the country's human and technical capacity to develop energy efficiency and renewable energy projects in Jamaica.
The CAST Energy Centre that was subsequently changed to the UTech Energy Centre in the mid 1990s was a leading training institution in all aspects of energy after it was assisted significantly under the USAID/GOJ energy conservation/renewable energy project in the mid 1980s.
The Energy Centre was established in 1983, as the CAST Energy Centre, while the institution was still a diploma granting college known as the College of Arts, Sciences and Technology (CAST).
www.mct.gov.jm /energy_3.htm   (3133 words)

  
 THE CONSERVATION OF ENERGY - Title
This kinetic energy was somehow stored in the mass when it was hanging from the ceiling: the energy was hidden, but has the potential to reappear as kinetic energy.
Conservation of energy tells us that the total energy of the system is conserved, and in this case, the sum of kinetic and potential energy must be constant.
As the spring is compressed, the kinetic energy of the block is gradually transferred to the spring where it is stored as potential energy.
teacher.pas.rochester.edu /phy121/LectureNotes/Chapter08/Chapter8.html   (2236 words)

  
 Conservation of Energy   (Site not responding. Last check: )
Not all of the energy of motion of the car is carried away by pieces of the car during the collision.
On its upward bounce, the energy of motion of the ball turns into gravitational potential energy until the ball comes to a stop with all its energy in the form of gravitational potential energy.
Some of the energy is changed by friction to heat of the rails and wheels so that the coaster gradually loses energy and can't climb back up to the top of the original hill.
www.boscobel.k12.wi.us /~schnrich/conservation_of_energy.htm   (821 words)

  
 Conservation of energy
Once we develop the concept of conservation of energy, we shall find that it would be possible to involve motions of more than one object as the part of process.
One of the significant aspects of describing a mechanical process is that it involves energies which are not associated with a single object but to the whole system, except for kinetic energy.
In words, mechanical energy of the system is equal to the sum of potential energy of the system (U) and the kinetic energies of the objects (K) in the system.
cnx.org /content/m14106/latest   (2443 words)

  
 Energy Conservation and Renewables - Conservation Policies - Sierra Club   (Site not responding. Last check: )
Energy conservation must be made a major national goal.
The Sierra Club believes that in the short and long term, energy conservation should be a stronger national and international goal and that it can be achieved with little, if any, meaningful change in material standards of living.
A national commitment to provide 25% of U.S. energy needs from solar energy by the year 2000 is a desirable and attainable objective, and specific policies and programs should be adopted to this end.
www.sierraclub.org /policy/conservation/energycons.asp   (837 words)

  
 Energy Alternatives - Conservation Section, Alternative Energy souces, conservation, conservation of energy, conserving ...
No matter how your energy is produced, it is cheaper to not use it in the first place.
With energy prices across North America skyrocketing, we are getting a lot of calls from customers who are on the grid, fed up with electricity or natural gas bills that are much higher than they were a year ago.
As part of its drive to see fossil fuels phased out in favour of renewable sources of energy in order to prevent further potentially disastrous climate change, it is very important to Greenpeace that solar energy becomes widely accepted and used.
www.energyalternatives.ca /conservation.asp   (2132 words)

  
 The Secret Lives of Energy - The Energy Problem - Conservation of Energy
Energy is one of the physical quantities that is conserved in our universe.
The one exception is in nuclear reactions where mass is turned into energy, and as we have seen, this occurs only in the center of stars and in nuclear reactors.
The energies are all changing in differnet ways depending on how much the spring is stretched and how high the object attached to the spring is. Note, however, that energy is conserved, the total energy stays the same (the bar on the right).
www.fi.edu /guide/hughes/energyconservation.html   (504 words)

  
 conservation of energy concept from the Astronomy knowledge base   (Site not responding. Last check: )
has definition The principle that the total energy of a closed system never changes, that energy is only converted from one form to another.
has definition The total energy of a system (including kinetic energy and gravitational energy) is conserved and does not vary.
Modern physics has modified the law of conservation of energy, since matter can be created or annihilated; a more general law is the conservation of mass and energy.
www.csi.uottawa.ca:4321 /astronomy/conservationofenergy.html   (149 words)

  
 The Secret Lives of Energy - The Energy Problem - Conservation of Energy
Energy is one of the physical quantities that is conserved in our universe.
The one exception is in nuclear reactions where mass is turned into energy, and as we have seen, this occurs only in the center of stars and in nuclear reactors.
The energies are all changing in differnet ways depending on how much the spring is stretched and how high the object attached to the spring is. Note, however, that energy is conserved, the total energy stays the same (the bar on the right).
fi.edu /guide/hughes/energyconservation.html   (504 words)

  
 Conservation of Energy
To fully understand the conservation of energy concept and equations, we performed a set of different experiments in the fluid mechanics undergraduate lab.
The first law of thermodynamics states that the time rate of increase of the total stored energy of the system is equal to the net time rate of energy addition by heat transfer into the system plus the net time rate of energy addition by work transfer into the system.
The losses in equation (1) involve all the irreversible dissipative losses of energy due to frictional effects, such as viscous dissipation that convert mechanical energy to non-recoverable heat loss (thermal energy).
www.msu.edu /~muhannad/energy.html   (884 words)

  
 OpinionJournal - Scene & Heard
Energy consumption hasn't gone down; rather, it has stubbornly risen by an average of about 1.7% a year since the early 1980s, despite the increasing weight of conservation policies.
None other than California is a bastion of conservation; according to the Energy Information Administration, part of the Department of Energy, it ranks 47th in per capita energy consumption among U.S. states.
Conservation must be seen for what it is--a personal virtue, a market-led way of allocating resources, and even a healthy awareness of man's place in this world.
www.opinionjournal.com /columnists/kstrassel/?id=95000484   (1002 words)

  
 Conservation of Energy
One such symmetry is known as the law of conservation of energy.
The principal of conservation of energy implies that the amount if energy that is involved does not change, and that only its form changes.
Conservation of energy is usually stated as the First Law of Thermodynamics which we will visit again when we discuss the laws of thermodynamics in Chapter 19.
www.csulb.edu /~rtoossi/PhysicsBook/book/Chap09-EnergyPower/Energy/conservation_energy.htm   (350 words)

  
 Conservation of Energy
In almost every analysis related to the Conservation of Energy Principle, the first step is to carefully look for forces acting on something that is in motion.
As is the case with work, a system's kinetic energy depends on the condition of the system as well as the coordinate frame used to look at the system.
The essence of the Energy Principle is that the internal energy, whose changes are defined by Eqn.
physics.ship.edu /~mrc/thermo/ttu_thermo/Energy/Energy.htm   (2460 words)

  
 SparkNotes: Conservation of Energy: Conservative vs. Nonconservative Forces
However, since at this point we are only familiar with mechanical energy, for now we can only use the principle of the conservation of energy if no energy is converted to other forms.
If a conservative force acts upon the particle during this closed loop, the velocity of the particle at the beginning and the end of the loop must be the same.
Though our first statement about conservative forces is powerful, this second statement proves to be the most applicable: we will use this concept to solve numerous problems in the sections to come.
www.sparknotes.com /physics/workenergypower/conservationofenergy/section1.html   (1311 words)

  
 Conservation of Energy/Mass
We can change matter to energy and energy to matter without gaining or losing any of either to the Universe.
Energy can be changed in form, from one to another, without any loss to the Universe.
These particles have a high kinetic energy which will cause the emission of a gluon, which changes the color of the quark but the total color of the quark, antiquark, and gluon will still cancel to zero.
www.sciencebyjones.com /conservation_of_energy_mass.htm   (562 words)

  
 SparkNotes: Conservation of Energy: Introduction and Summary
Such a relation is not the extent of our understanding of the concept of energy, and we now are able to fully explore this interesting topic, using both what we already know about work and dynamics, along with the introduction of some new concepts.
The conservation of energy is one of the most important concepts in physics.
An understanding of potential energy, combined with what we already know about kinetic energy will allow us to derive the fundamental concept of the conservation of mechanical energy.
www.sparknotes.com /physics/workenergypower/conservationofenergy/summary.html   (275 words)

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