Business

US to reopen Boeing-Airbus bidding war over refuellers

The US Air Force is set to reopen a bidding war between Boeing and arch-rival Airbus over the replacement of its ageing fleet of refuelling aircraft essential to Washington's ability to project power beyond its borders.

Security

'Holy moly!': Inside Texas' fight against a ransomware hack

It was the start of a steamy Friday two Augusts ago when Jason Whisler settled in for a working breakfast at the Coffee Ranch restaurant in the Texas Panhandle city of Borger. The most pressing agenda item for city officials ...

Computer Sciences

New simulator helps robots sharpen their cutting skills

Researchers from the University of Southern California (USC) Department of Computer Science and NVIDIA have unveiled a new simulator for robotic cutting that can accurately reproduce the forces acting on a knife as it slices ...

Security

$10 million rewards bolster White House anti-ransomware bid

The State Department will offer rewards up to $10 million for information leading to the identification of anyone engaged in foreign state-sanctioned malicious cyber activity, including ransomware attacks, against critical ...

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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