News tagged with energy

Related topics: electricity · energy consumption · renewable energy · energy efficiency · fossil fuels

Are energy drinks safe?

Despite reported health concerns, the popularity of energy drinks is steadily climbing. Between 2008 and 2012, for example, energy drink sales jumped by 60% in the United States. By 2017, annual energy drink sales in the ...

Sep 16, 2016
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Standing up for weight management

Alternating positions between standing and sitting while performing deskwork could make the difference in whether the thin red needle in your bathroom scale tilts to the left or the right of your goal weight.

Aug 29, 2016
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Government's childhood obesity plan flawed

The Government's childhood obesity plan is based on outdated evidence, shows the Government values corporate profit over public good and is unlikely to solve the New Zealand obesity crisis, according to a new critique.

Aug 19, 2016
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Uncovering a new pathway to halting metastasis

Metastasis, the process by which cancer cells leave the primary tumor and spread to other sites in the body, is responsible for more than 90 percent of cancer deaths. Thus, there is a significant need to improve the therapeutic ...

Aug 19, 2016
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Energy

In physics, energy (from the Greek ἐνέργεια - energeia, "activity, operation", from ἐνεργός - energos, "active, working") is a scalar physical quantity that describes the amount of work that can be performed by a force, an attribute of objects and systems that is subject to a conservation law. Different forms of energy include kinetic, potential, thermal, gravitational, sound, light, elastic, and electromagnetic energy. The forms of energy are often named after a related force.

Any form of energy can be transformed into another form, but the total energy always remains the same. This principle, the conservation of energy, was first postulated in the early 19th century, and applies to any isolated system. According to Noether's theorem, the conservation of energy is a consequence of the fact that the laws of physics do not change over time.

Although the total energy of a system does not change with time, its value may depend on the frame of reference. For example, a seated passenger in a moving airplane has zero kinetic energy relative to the airplane, but non-zero kinetic energy relative to the Earth.

This text uses material from Wikipedia, licensed under CC BY-SA

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