Energy & Green Tech
The 2019 Toyota Mirai electric vehicle touts zero emissions, thanks to a fuel cell that runs on hydrogen instead of gasoline. But the Mirai has barely left California, partly because today's fuel cell electrodes are made ...
Feb 25, 2019
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Engineering
Anyone who's seen a gecko will likely know they can climb walls. But these common lizards can also run across water nearly as fast as they can move on solid ground. Yet while we know how geckos scale smooth vertical surfaces ...
Dec 7, 2018
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Engineering
Cuff devices for blood pressure measurement are inconvenient, and mobile device apps for blood pressure measurement that are now being introduced may lack accuracy.
Mar 9, 2018
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Engineering
Illinois Professor Naira Hovakimyan is poised to enter into an unprecedented third round of flight tests using her L1 adaptive control system.
Feb 27, 2018
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Internet
In a report leaked to the Australian media, Facebook has outlined how it can use an analysis of activity and sentiment of users posting on its platforms to identify their various levels of anxiety.
May 3, 2017
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Business
Passenger traffic at European airports returned to pre-COVID levels in the first half of the year as the sector finally "turned the corner" on the pandemic crisis, the main industry association said on Wednesday.
Jul 31, 2024
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Business
Hollywood's video game performers announced they would go on strike Thursday, throwing part of the entertainment industry into another work stoppage after talks for a new contract with major game studios broke down over artificial ...
Jul 25, 2024
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Automotive
70% of speeding motorists agree that seeing Community Speed Watch activity would make them drive slower in future.
Jun 13, 2024
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Other
The Singapore Airlines jetliner that hit severe turbulence last week went through huge swings in gravitational force in less than five seconds, likely causing the injuries to people who weren't buckled into their seats, according ...
May 29, 2024
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Electronics & Semiconductors
A newly formed Texas Innovation Consortium Fund will promote microchip production in the state and expand workforce training programs at colleges and universities, Gov. Greg Abbott announced March 19 at the University of ...
Mar 20, 2024
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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
