Diseases, Conditions, Syndromes

Experts call for more clinical trials on alcohol use, liver disease

More clinical research is needed to investigate how reducing alcohol consumption in patients with alcohol-related liver disease (ALD) may slow disease progression and improve outcomes, according to an international task force ...

Gerontology & Geriatrics

Study finds major hearing difficulties in people over 90

A study from the University of Gothenburg examined a scarcely studied group in the context of hearing: People over 90. When it comes to age and hearing problems, we often talk about younger elderly (65–79 years) and older ...

Health

FDA, DOJ form task force to fight illegal vapes

The U.S. Food and Drug Administration announced Monday that it has joined up with the Department of Justice and several other federal agencies to do more to stop the sale of illegal e-cigarettes in this country.

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Force

In physics, a force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma, was originally formulated in slightly different, but equivalent terms: the original version states that the net force acting upon an object is equal to the rate at which its momentum changes.

Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses, a technical term for influences which cause deformation of matter. While mechanical stress can remain embedded in a solid object, gradually deforming it, mechanical stress in a fluid determines changes in its pressure and volume.

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