# Energy equation mass velocity conversion – Subscribe to RSS

## Eighteenth century theories on the correlation of mass and energy included that devised by the English scientist Isaac Newton in , who speculated that light particles and matter particles were interconvertible in "Query 30" of the Opticks , where he asks: "Are not the gross bodies and light convertible into one another, and may not bodies receive much of their activity from the particles of light which enter their composition?

This is the right-momentum that the object lost.

Keep in mind that this is EACH reaction.

The earth revolving around the sun, you walking down the street, and molecules moving in space all have kinetic energy. Archived from the original on 13 October

However, scientists still did not see such reactions as a practical source of power, due to the energy cost of accelerating reaction particles.

The Roanoke Times. Kinetic energy.

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If the object's speed is larger than a couple of percentages of the speed of light in vacuum it is a poor energy equation mass velocity conversion according to relativistic mechanics. In analyzing these explosions, Einstein's formula can be used with E as the energy released and removed, and m as the change in mass. The balloon stays on the scales and you are able to measure changes in its mass. The most popular and commonly used kinetic energy units are:.

New York. Tolver We can always use speed converter to find that it's around masa. Help Learn to edit Community portal Recent changes Upload file. Bibcode : Natur. An object moves with different speeds in different frames of referencedepending on the motion of the observer. The explanation was that, in certain nuclear processes, a small amount of mass is destroyed and energy is released and carried by nuclear radiation.

If the object moves quickly, the relativistic mass is greater than the rest mass by an amount equal to the mass associated with the kinetic energy of the object. Berkeley: University of California Press. Bibcode : Natur. In other places, however, Einstein and Infeld seem a bit more cautious and suggest only that one can construct a physics with only fields in its ontology. Einstein's equation, by theory, can give these energies by measuring mass differences before and after reactions, but in practice, these mass differences in were still too small to be measured in bulk. Antimatter is rare in our universehowever, and the known mechanisms of production require more usable energy than would be released in annihilation. Wikimedia Commons Wikisource.

## 1. The Physics of Mass-Energy Equivalence

It would not seem like you could just plug any number lbs unrelated to another number 40mph and get back N-m. Energy can be measured in many different units; Joules are just one of them. In some cases, as in the limit of small velocity here, most terms are very small. Physical Review D.

Such extra mass, in theory, could be mass velocity conversion in the same way as any other type of rest mass, concersion though individually photons have no rest mass. It even works in reverse, just input any two known variables and you will receive the third! How about you give our kinetic energy calculator a try? You will still get an answer that is an energy. What is kinetic energy? Among the things to be considered are the distance to the star, the velocity, and the mass of the astronaut and ship. Bibcode : AnP

CERN estimated in that over a billion times more energy is required to make eneryg store antimatter than could be released in its annihilation. Kinetic energy. Because of the relationship of rest energy to mass, we now consider mass to be a form of energy rather than something separate. However, as the mass is accelerated, its momentum p increases, thus increasing the total energy.

## Total Energy and Rest Energy

We have also canvassed a variety of philosophical interpretations of mass-energy equivalence. Instead, when one analyzes a physical object theoretically by looking at its component parts, one has to decide the level of granularity at which one wishes to analyze the object. PMID

Albert Einstein: philosopher-scientist 3d ed. A tokamak is a form of mass velocity conversion fusion reactor, which can change velpcity to energy. The frequency of the light detected was higher than the light emitted. What is the formula for calculating kinetic energy? The earth revolving around the sun, you walking down the street, and molecules moving in space all have kinetic energy. Similarly, kinetic or radiant energy can be used to create particles that have mass, always conserving the total energy and momentum.

Similarly, kinetic or radiant energy can be used energg create particles that have mass, always conserving the total energy and momentum. From a very general point of view, the reasoning in these types of derivations can be displayed schematically, if somewhat roughly, like this:. In relativityall the energy that moves with an object i. Tata McGraw-Hill Education. Introduction Astronomy Tools Concepts 1. Past experiments.

Kinetic energy, like all forms of energy, can be transformed into another kind of energy. Lange then goes on to argue that a careful analysis of purported conversions of mass-energy equivalence reveals that there is no physical process by which mass is ever converted into energy. According to the Einstein Papers Project at the California Institute of Technology and Hebrew University of Jerusalemonly four known copies of the equation as written by Einstein are known. Torretti, R. October

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Principle of the equivalence of mass and energy in a system's rest frame. If a system is bound by attractive forces, and the energy gained in excess of the work done is removed from the system, then mass is lost with this removed energy. New York: John Wiley.

To illustrate these changes, Section 1. Contact Us. In general, derivations in this group use the same style of reasoning. Wikimedia Commons Wikisource.

Einstein mentions in his msss that mass—energy equivalence might perhaps be tested with radioactive decay, which was known by then to release enough energy to energy equation mass velocity conversion be "weighed," when missing from the system. TanMath TanMath 1, 2 2 gold badges 16 16 silver badges 40 40 bronze badges. The earth revolving around the sun, you walking down the street, and molecules moving in space all have kinetic energy. That number is obtained mainly because of its impressive mass. Kinetic energy formula The kinetic energy formula defines the relationship between the mass of an object and its velocity.

## Navigation menu

To calculate kinetic energy: Find the square of the velocity of the object. This frequency and thus the relativistic energy are frame-dependent. Calculators Converters Randomizers Articles Search. These particles and some of their characteristics will be covered in Particle Physics. Equivalence principle Riemannian geometry Penrose diagram Geodesics Mach's principle.

Mass velocity faster the observer is traveling with regard to the source when the photon catches up, the less energy the photon would be seen to have. If the object moves slowly, the relativistic mass is nearly fnergy to the rest mass and both are nearly equal to the classical inertial mass as it appears in Newton's laws of motion. Let's take a look at some computational kinetic energy examples to get to grips with the various orders of magnitude: Some of the highest energy particles produced by physicists e. Background Introduction Mathematical formulation. First, total energy is related to momentum and rest mass. The mass—energy equivalence in special relativity refers to the inertial mass. Plug the knowns into the equation.

It was later shown that the process occurs rapidly at extremely high temperatures that would only have been reached shortly after the Big Bang. Torretti continues:. Edition -- July 1, Vol. Such a change in mass mass times speed only happen when the system is open, and the energy and mass are allowed to escape. However, if we ever find good evidence to support the view that some particles have no internal structure, as it now seems to be the case with electrons for example, then we either have to give up the Bondi-Spurgin interpretation or use the interpretation itself to argue that such seemingly structureless particles actually do contain an internal structure. The faster an object moves relative to some inertial frame, the more momentum and kinetic energy it has.

Einstein himself gave a purely dynamical derivation Einstein,though he velocify mentions either Langevin or Perrin. Einstein mentions energy equation mass velocity conversion his paper that mass—energy equivalence might perhaps be tested with radioactive decay, which was known by then to release enough energy to possibly be "weighed," when missing from the system. More recently, Rainville et al. Modern physics 4th ed. This weight loss and mass loss would happen as the box was cooled by this process, to room temperature. During the nineteenth century there were several speculative attempts to show that mass and energy were proportional in various ether theories.

## What is kinetic energy?

Alternative formulations of special relativity Physics portal Category. It is his observations concerning ii that force us to face again the question of why the energy of the constituents of a physical system manifests itself as the mass of the system, though admittedly the question itself may simply reveal a failure fully to appreciate a relativistic description of composite systems. But the subject was scientifically interesting because it gave insight into the atoms.

Mark Eichenlaub Mark Eichenlaub Such extra mass, in theory, could be weighed in the same way as any other type of rest mass, even though individually photons have no rest mass. This kinetic energy calculator is a tool which helps you assess the energy of motion. Special Relativity.

Multiply it with the mass of the object. Kinetic and Potential Energy. If an observer runs away from a photon in the direction the photon travels from a source, and it catches up with the observer, the observer sees it as having less energy than it had at the source. Applied physics Astrophysics Atomic, molecular, and optical physics Biophysics Condensed matter physics Geophysics Nuclear physics Optics Particle physics. Example 1. The extension of Einstein's equation to these systems is given by: [25] [26] [note 2]. La Salle, Ill.

## Relativistic Energy

However, the Bondi-Spurgin interpretation energy equation mass velocity conversion mass-energy equivalence has the demerit that it fails to address enetgy such as the electron-positron annihilation reaction. April However, if the same process is considered in a frame that moves with velocity v to the left, the pulse moving to the left is redshiftedwhile the pulse moving to the right is blue shifted. Guest Contributions.

A kg car 2 tons travelling at Table of contents: Kinetic energy definition What is kinetic energy? The conservation of energy is a universal principle in physics and holds for any interaction, along with the conservation of momentum. With the kinetic energy formula, you can estimate how much energy is needed to move an object.

Once we do this, Eddington claims, the distinction between mass and energy disappears. Jeffery trans. Minkowski and H. Everyone has seen this equation, and everyone knows this is Einstein's famous "mass equals energy" equation. Notation used in this entry.

## Kinetic energy definition

However, the Bondi-Spurgin interpretation offers no explanation concerning why vonversion energy of the constituents of a physical system, be it potential energy or kinetic energy, manifest itself as part of the inertial mass of the system as a whole. The only combination of answers to questions 1 and 2 that is inconsistent is to say that mass and energy are the same property of physical systems but that the conversion of mass into energy or vice versa is a genuine physical process. The mass—energy equivalence in special relativity refers to the inertial mass.

Conversion this case, the mass of the container is given by its total energy including the kinetic energy of the gas moleculessince the system's total energy and invariant mass are the same in any reference frame where the momentum is zero, and such a reference frame is also the only frame in which the object can be weighed. Mechanics, 2E. So physicists and philosophers writing about mass-energy equivalence tend to focus on the highly idealized notion of an ideal gas. Philosophically, to think of fields as stuff is also controversial. Other Internet Resources [Please contact the author with suggestions.

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An infinite amount of work and, hence, an infinite amount of energy input is required to accelerate a mass to the speed of light. The following article will explain: What is kinetic energy Eqyation the kinetic energy formula is used The definition of kinetic energy What are some common kinetic energy units What is the difference between potential and kinetic energy How the work-energy theorem can be applied How the dynamic pressure and the kinetic energy equations relate to each other. Boston, MA. Einstein mentions in his paper that mass—energy equivalence might perhaps be tested with radioactive decay, which was known by then to release enough energy to possibly be "weighed," when missing from the system. Would I be correct in stating the following? Compute the kinetic energy of a relativistic object.

We might say that the principle of the conservation of energy, having previously swallowed up that of the conservation of heat, now proceeded to swallow that of the conservation of mass—and holds the field alone. In relativistic physics, as in classical physics, mass and energy are both regarded as properties of physical systems or properties of the constituents of physical systems. Another seminal experiment, the Pound—Rebka experimentwas performed in Guest Contributions. For a more detailed description of a simplified derivation in this group, see Section 1. October

## Science Physics Formulas

Retrieved May 23, — via Associated Press. It only takes a minute to sign up. Compute the kinetic energy of a relativistic object.

Although part of the reason is merely that Einstein used different letters for energy, mass, and the speed of light in his early papers discussing mass-energy equivalence in anddeeper reasons related to how we should understand the result quickly emerged. Download as PDF Printable version. Notation used in this entry. Archived from the original on October 16, Second page of section 2. See also Taylor and Wheelerp. In relativityall the energy that moves with an object i.

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Other Internet Resources [Please contact the author with suggestions. Retrieved 14 October Beyond these interpretations, we will also discuss two other types of interpretations of mass-energy equivalence that do not fit neatly in Table 2. However, a magnetic domain is a chunk of iron that contains many, many atoms. We might say that the principle of the conservation of energy, having previously swallowed up that of the conservation of heat, now proceeded to swallow that of the conservation of mass—and holds the field alone. Einstein used the centimeter gram second system of units cgsbut the formula is independent of the system of units. Brans—Dicke theory Kaluza—Klein Quantum gravity.

Calculate the kinetic energy in Joules possessed by each of the following objects. Energy equation mass velocity conversion instance, the " Gadget "-style bomb used in the Trinity test and the vrlocity of Nagasaki had an explosive yield equivalent to 21 kt of TNT. It's impressive when you realize what an enormous number of molecules is there in one insect. Here, Einstein used V to represent the speed of light in a vacuum and L to represent the energy lost by a body in the form of radiation. The work-energy principle states that the amount of work done on an object is equal to the change in kinetic energy.

The observation confirmed that the energy carried by light indeed is equivalent to a gravitational mass. The Fermi National Accelerator Laboratory, near Batavia, Illinois, was a subatomic particle collider that accelerated protons and antiprotons to attain energies up to 1 Tev a trillion electronvolts.

Basic Relativity. However, in several other places, for example when Lange argues for the reality of the Minkowski intervalp.

It turns out that kinetic energy and the amount of work done in the system are strictly correlated, and their relation can be described by the work-energy theorem. The initial value of the energy is arbitrary, as only the change in energy can be measured, so the m 0 c 2 term is ignored in classical physics.

Philosophical Transactions of the Royal Society of London.

Example 3. Also calculate the amount of mass that must be converted to energy to get the astronaut and ship to the velocity travelled. Kinetic energy. This is the right-momentum that the object lost.

Physics portal. October For other purposes, we may elect to analyze the sample of iron all the way down to the atomic level. Stachel, J. Current experiments. The energy, and therefore the gravitational mass, of photons is proportional to their frequency as stated by the Planck's relation.

Thus, according to both interpretations, mass and energy are the same properties of physical systems. Research fields. Answer: nothing Taylor and Wheelerp. Thus, Rindler seems to be suggesting that we should confine our interpretation of mass-energy equivalence to what we can deduce from special relativity.

Consider a thought experiment. Kinetic energy units The units of kinetic energy are precisely the same as for any other type of energy.

During the nineteenth century there were several speculative attempts to show that mass and energy were proportional in various ether theories.

This effect can be understood by looking at the potential energy of the individual components.

Rindler, and R. We have already used this aspect of the derivation in our presentation above.

Wikimedia Commons has media related to Einstein formula. Rutherford also suggested that energy equation mass velocity conversion internal energy is stored within normal matter as well. Einstein himself gave a purely dynamical derivation Einstein,though he nowhere mentions either Langevin or Perrin. This in turn assumes that we can, in all cases, understand a reaction by examining the constituents of physical systems. In relativityall the energy that moves with an object i.

Background Principle of relativity Galilean relativity Galilean transformation Special relativity Doubly special relativity. See Figure 3. Physical Velcity Letters. How much mass is destroyed in one year to produce a continuous MW of electric power? You will still get an answer that is an energy. After eliminating the idea of absorption and emission of some sort of Lesagian ether particles, the existence of a huge amount of latent energy, stored within matter, was proposed by New Zealand physicist Ernest Rutherford and British radiochemist Frederick Soddy in

## 2. Philosophical interpretations of \(E_o = mc^2\)

Physics Today. Namespaces Article Talk. The only way it could have lost momentum is by losing mass.

Some of the highest energy particles produced by physicists e. We know that the velocity of an object with mass has an upper emergy of c. Potential energy refers to the gravitational pull exerted on an object, relative to how far it has to fall. It is, of course, pedagogically sound to make a strong distinction, but it doesn't have a historical basis. However, as the mass is accelerated, its momentum p increases, thus increasing the total energy. Particles are accelerated to extremely relativistic energies and made to collide with other particles, producing totally new species of particles.

Easily calculate the kinetic energy of an object in motion. Rutherford was reported in to have declared that this energy could not be exploited efficiently: "Anyone who expects a source of power from the transformation of the atom is energy equation mass moonshine. Proceedings of the American Academy of Arts and Sciences. If you have thought about who sees what, who is moving with the event being observed, who sees proper time, and so on, you will find it much easier to determine if your calculation is reasonable. There followed also the principle of the equivalence of mass and energy, with the laws of conservation of mass and energy becoming one and the same. Kinetic energy formula The kinetic energy formula defines the relationship between the mass of an object and its velocity. See Figure 2.

Fortunately Lise Meitner remembered how to compute the masses of nuclei… and worked out that velocity conversion two nuclei formed… would be lighter by about one-fifth the mass conversoon a proton. Improve this question. Vibrational kinetic energy - can be visualized as when a particle moves back and forth around some equilibrium point, approximated by harmonic motion. Potential and kinetic energy Potential energy refers to the gravitational pull exerted on an object, relative to how far it has to fall. Also calculate the amount of mass that must be converted to energy to get the astronaut and ship to the velocity travelled. OCLC

Bibcode : JRE The British theoretical physicist Stephen Hawking theorized [24] it is possible to throw matter into a black hole and use the emitted heat to generate power. Although both Einstein and Infeld and Zahar use the same basic argument, they reach slightly different conclusions.

Calculate the kinetic energy in Joules possessed by each of the following objects. What happens to the mass of water in a pot when it cools, assuming no molecules escape or are added? If you'd like to cite this online calculator resource and energy equation mass velocity conversion as provided on the page, you can use the following citation: Georgiev G. Stack Overflow for Teams — Collaborate and share knowledge with a private group. I will edit to say for scientific purposes, pound is a force Download as PDF Printable version. The equation was featured on page 2 of the Smyth Reportthe official release by the US government on the development of the atomic bomb, and by the equation was linked closely enough with Einstein's work that the cover of Time magazine prominently featured a picture of Einstein next to an image of a mushroom cloud emblazoned with the equation.

Without this second term, there would be an additional contribution conbersion the energy when the particle is not moving. Let's take a look at some computational kinetic energy examples to get to grips with the various orders of magnitude: Some of the highest energy particles produced by physicists e. The Sun a and the Susquehanna Steam Electric Station b both convert mass into energy—the Sun via nuclear fusion, the electric station via nuclear fission. What is the velocity of the ball? CC licensed content, Shared previously.

Mass is veolcity measure of how much there is of something. Not only does energy have many important forms, but each form can be converted to any other. In older physics terminology, relativistic energy is used in lieu of relativistic mass and the term "mass" is reserved for the rest mass. We will carry extra digits because this is an intermediate calculation. Particles are accelerated to extremely relativistic energies and made to collide with other particles, producing totally new species of particles. Van Nostrand.

Jeffery trans. He explains:. Reasoning energy equation mass velocity conversion these lines, Ohanianhas argued that Einstein should not be credited with proving his famous equation. The only combination of answers to questions 1 and 2 that is inconsistent is to say that mass and energy are the same property of physical systems but that the conversion of mass into energy or vice versa is a genuine physical process.

Another criticism was formulated by American physicist Herbert Ives in and the Israeli physicst Max Jammer inasserting that Einstein's derivation is based on begging the question. Does the mass of the balloon change as the day progresses? Main articles: Conservation of energy and Conservation of mass. Not only does energy have many important forms, but each form can be converted to any other. That is the convention. If a transparent window passing only electromagnetic radiation were opened in such an ideal box after the explosion, and a beam of X-rays and other lower-energy light allowed to escape the box, it would eventually be found to weigh one gram less than it had before the explosion.

However, I do know one particular application of KE to motion. What is the velocity ehergy the ball? If the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared. Concepts of mass : in classical and modern physics.

A football traveling towards the field goal at about Mechanics, 2E. Note that much more energy is required to reach high velocities than predicted classically. A 71 kg man walking at 1. Main article: Energy—momentum relation.

## Science Physics Formulas

It is also consistent with how mass and energy are treated in general relativity. Princeton, N. However, influenced perhaps by the widely-known discussion of mass-energy equivalence by Bondi and Spurgin see Section 2.

All rights reserved. Finally, in Newtonian mechanics, an object in motion relative to a reference frame also has velocity credit energy, or energy of motion. Rutherford was reported in to have declared that this energy could not be exploited efficiently: "Anyone who expects a source of power from the transformation of the atom is talking moonshine. An object moves with different speeds in different frames of referencedepending on the motion of the observer. Prior to this, the ease of measuring radioactive decay energies with a calorimeter was thought possibly likely to allow measurement of changes in mass difference, as a check on Einstein's equation itself. However, one could argue that although the same-property interpretation makes this assumption, it is not an unjustified assumption.

The kinetic energy equation is as follows:. Proper time Proper mass Four-momentum.

Reasoning along these lines, Ohanianhas argued that Einstein should not be credited with proving his famous equation. Bulletin of the Atomic Scientists.

In this process, a relatively small mass of fuel is converted into a large amount of energy. Each of these particles has a kinetic energy of mc 2 up to a small numerical factor.

In Section 1. However, comparatively little philosophical attention has been paid to how special relativity brings about corresponding changes to the third fundamental dimension in basic physics: mass.

Discuss the difficulties in carrying out this experiment. Embed this tool!

Relativity: The Special and General Theory. For closed systems made up of many parts, like an atomic nucleusplanet, or star, the relativistic energy is given by the sum of the relativistic energies of each of the parts, because energies are additive in these systems. S2CID Lange could easily grant that rest energy is a real property of physical systems and still argue i that there is no such thing as a physical process of conversion between mass and energy and ii that purported conversions result from shifting levels of analysis when we examine a physical system. When comparing the mass of 4 hydrogen atoms to a helium atomthere is some mass loss:.

We have also canvassed a variety of philosophical interpretations of mass-energy equivalence. Interpretations of mass-energy equivalence can be energy equation mass velocity conversion according to how they answer questions 1 and 2 above Flores Background Introduction Mathematical formulation. Answer: nothing Taylor and Wheelerp. In general, derivations in this group use the same style of reasoning. However, since the equivalence of mass and energy entails that mass and energy are really the same physical property after all, say Einstein and Infeld and Zahar, one can no longer distinguish between matter and fields, as both now have both mass and energy.

However, as Einstein later observedmass-energy equivalence is a result that should be independent of any theory that describes a specific physical interaction. This was tackled by Einstein in his paper "Does the inertia of a body depend upon its energy content? To perform this kind of analysis for a concrete object is a rather subtle affair.

Consequently, the entire system if we draw the boundary of the system around the reactants and products—which is, of course, a spatial and temporal boundaryhas a non-zero rest-mass prior to the collision. Introduction to elementary particles 2nd, rev. Help Learn to edit Community portal Recent changes Upload file. Bibcode : PhRvD.

Einstein et al. Rutherford was eenergy in to have declared that this energy could not be exploited efficiently: "Anyone who expects a source of power from the transformation of the atom is talking moonshine. Consequences Time dilation Length contraction Relativistic mass Mass—energy equivalence Relativity of simultaneity Relativistic Doppler effect Thomas precession Relativistic disk Bell's spaceship paradox Ehrenfest paradox. Feynman, R.

Place these two vessels of gas on the ends of a balance. Albert Einstein. Newbery ; O. One view is that only rest mass is a viable concept and is a property of the particle; while relativistic mass is a conglomeration of particle properties and properties of spacetime. Wikimedia Commons has media related to Einstein formula.

Both the actual increase in mass and the percent increase are very small, since energy is divided by c 2a very large number. What happens to the mass of water in a pot when it cools, assuming no molecules escape or are added? Principle of relativity Theory of relativity. It is thus not possible for an object having mass to reach the speed of light. J Correct! Depending on the structure it can be shown as stretching, twisting, or bending.

Download as PDF Printable version. Thus, the mass—energy equivalence, combined with the Weak Energy equation mass velocity conversion Principle, results in the prediction that all forms of energy contribute to the gravitational field generated by an object. The physics really lies in the three corresponding conservation principles associated with these quantities: the principle of conservation of mass, the principle of conservation of energy, the principle of conservation of linear momentum. Thus, if a stick of dynamite is blown up in a hermetically sealed chamber, the mass of the chamber and fragments, the heat, sound, and light would still be equal to the original mass of the chamber and dynamite.

Remember to use the correct number of significant figures in your answer. To convert to kg, multiply your pounds by.

Beyond these interpretations, we will also discuss two other types of interpretations of mass-energy equivalence that do not fit neatly in Table 2. The initial value of the energy is arbitrary, as only the change in energy can be measured, so the m 0 c 2 term is ignored in classical physics.

Having gained this energy during its acceleration, the body maintains its kinetic energy unless its speed changes. Physicists typically use the term massthough experiments have shown an object's gravitational mass depends on its total energy and not just its rest mass.

PMID

Is there any point in getting v a little closer to c than It has no counterpart in classical Newtonian physics, where energy never exhibits weighable mass.

The mass of the Solar System masss slightly less than the sum of its individual masses. London; Boston: W. In fact, conservation of mass meaning total mass is constant was one of the great laws verified by 19th-century science. If a system is bound by attractive forces, and the energy gained in excess of the work done is removed from the system, then mass is lost with this removed energy. The energy input becomes part of the total energy of the object and, thus, increases its rest mass. Another seminal experiment, the Pound—Rebka experimentwas performed in

The mass of an electron is 9. There followed also the principle of the equivalence mwss mass energy equation mass velocity conversion energy, with the laws of conservation of mass and energy becoming one and the same. The energy input becomes part of the total energy of the object and, thus, increases its rest mass. Kinetic energy examples You're sitting in class and your teacher tells you that the kinetic energy of an object equals 1 J. Main article: Energy—momentum relation.