Mechanics, branch of physics concerned with the motion of bodies under the … Contact online >>
Mechanics, branch of physics concerned with the motion of bodies under the
conservation of energy, principle of physics according to which the energy of
potential energy, stored energy that depends upon the relative position of
principles of physical science, the procedures and concepts employed by
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Energy is defined as the ability to do work. There are many different forms of energy. According to the law of conservation of energy, energy may convert to other forms, but is never created or destroyed. Here is a list of 10 common types of energy and examples of each of them. Any object may possess multiple types of energy.
Example: An example of kinetic energy is a child swinging on a swing. At the top of the swing’s arc, the kinetic energy is zero. No matter whether the child is swinging forward or backward, the kinetic energy is always zero or positive.
Kinetic energy is often discussed with potential energy because these two forms of energy readily convert between each other. Potential energy is energy of an object’s position.
Examples: A classic example of potential energy is an apple resting on a table. The potential energy of the apple is zero with respect to the table, but positive with respect to the floor on which the table rests. In the case of a swinging child, potential energy is at its maximum when the swing is highest and at its minimum (zero) when the swing is closest to the ground.
Mechanical energy is the sum of the kinetic and potential energy of a system. It is the energy resulting from the movement or physical location of an object. Either the kinetic or potential energy may be zero at any given time.
Example: A car driving up and down a hill has both kinetic and potential energy. The car gains potential energy as it nears the top of the hill. Unless the brakes are applied, it gains kinetic energy as it goes down the hill.
Nuclear energy is the energy of the atomic nucleus. It may be released by nuclear reactions or other changes in the nucleus.
Examples: Radioactive decay, nuclear fission, and nuclear fusion are examples of nuclear energy. Other examples include nuclear power and energy released by an atomic explosion.
Example: The first ionization energy is the energy required to remove one electron completely. The second ionization energy is the energy required to remove a second electron. It is always greater than the first ionization energy.
Chemical energy is energy released or absorbed by chemical reactions between atoms and molecules. Like ionization energy, it is an energy associated with electrons. Chemical energy may be divided into additional categories of energy, including chemiluminescence and electrochemical energy.
Examples: A glowstick releases light from a chemical reaction. A battery generates electrical energy from a chemical reaction.
Electromagnetic energy is also called radiant energy. It is energy from light, magnetism, or electromagnetic radiation.
Examples: Any portion of the electromagnetic spectrum has energy, including radio, microwaves, visible light, x-rays, gamma radiation, and ultraviolet light. Similarly, magnets produce an electromagnetic field and have energy.
Thermal energy is energy associated with heat. It is a type of electromagnetic energy. Thermal energy reflects the temperature difference between two systems.
Example: A cup of hot coffee has thermal energy. It releases heat to the environment.
Sonic energy is energy associated with sound waves. Sound waves travel through air or any other medium.
Examples: Examples of sonic energy include a sonic boom, your voice, or a song.
Gravitational energy is the attractive energy between objects based on their mass. Often, it serves as a basis for mechanical energy, as objects have potential energy with respect to one another and may move closer to each other.
Examples: The gravitational energy between the Earth and Moon produces the Moon’s orbit. Gravitational energy holds the atmosphere to the Earth.
The concept of energy is key to science and engineering. Here is the definition, examples of energy, and a look at the way it is classified.
In science, energy is the ability to do work or heat objects. It is a scalar physical quantity, which means it has magnitude, but no direction. Energy is conserved, which means it can change from one form to another, but isn’t created or destroyed. There are many different types of energy, such askinetic energy,potential energy, light, sound, andnuclear energy.
The term “energy” comes from the Greek wordenergeiaor from the French wordsenmeaning in andergonwhich means work. The SI unit of energy is the joule (J), where 1 J = 1kg⋅m2⋅s−2. Other units include the kilowatt-hour (kW-h), British thermal unit (BTU), calorie (c), kilocalorie (C), electron-volt (EV), erg, and foot-pound (ft-lb).
One form of energy may be converted into another without violating a law of thermodynamics. Not all of these forms of energy are equally useful for practical applications. When energy is “lost”, it means the energy can’t be recaptured for use. This usually occurs when heat is produced. Losing energy doesn’t mean there is less of it, only that it has changed forms.
Energy may be either renewable or nonrenewable. Photosynthesis is an example of a process the produces renewable energy. Burning coal is an example of nonrenewable energy. The plant continues to produce chemical energy in the form of sugar, by converting solar energy. Once coal is burned, the ash can’t be used to continue the reaction.
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