Overweight & Obesity

The body produces new satiety factor during prolonged exercise

A drug that helps us to eat less could help the more than 650 million people around the world who live with obesity. One of the emerging drug candidates that interest researchers is the hormone GDF15 that, when given to rodents, ...

Oncology & Cancer

As seasons change, so should diet for breast cancer survivors

Just as the four seasons bring changes in nature, they also impact how our bodies assimilate and metabolize food. Research indicates winter brings higher metabolic rates compared with summer, and so it calls for energy efficient ...

Medications

Type 2 diabetes: Drugs initially increase glucose production

Although SGLT-2 inhibitors are central to the treatment of diabetes, their exact mode of action was hitherto unknown. In a study conducted by a research group led by Peter Wolf, Martin Krssak and Michael Krebs from MedUni ...

page 1 from 40

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