Diseases, Conditions, Syndromes

With first case, Latin America prepares for COVID-19 virus

With Brazil reporting the first case of the COVID-19 virus, neighboring countries and other nations around Latin America were attempting to block the possible arrival of the virus.

Diseases, Conditions, Syndromes

Pence tries to project calm as virus response coordinator

Vice President Mike Pence moved Thursday to project calm in the role of chief coordinator of the government's response to the new coronovirus, as the Trump administration rushed to contain mounting public concerns and steep ...

Cardiology

Can a phone call help restart the heart?

When the heart suddenly stops beating, each passing moment can mean life or death. That is why emergency health providers and advocates are urging states to develop uniform standards and training for telecommunicator CPR.

Diseases, Conditions, Syndromes

Virus outbreak in Iran sickens hundreds, including leaders

After facing sanctions and the risk of war amid tensions with the United States, Iran's Shiite theocracy now has an enemy in the new coronavirus that infiltrated its leadership in plain view of state-controlled media and ...

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.

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