A new analysis of satellite data finds that the record surge in atmospheric methane emissions from 2020 to 2022 was driven by increased inundation and water storage in wetlands, combined with a slight decrease in atmospheric ...
Earth Sciences
Sep 24, 2024
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51
Scientists are conducting experiments in search of evidence of a possible critical point in the Quantum Chromodynamics phase diagram. Quantum chromodynamics describes how the strong force binds quarks and antiquarks together ...
General Physics
Sep 24, 2024
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15
Most of the exoplanets we've discovered orbit red dwarf stars. This isn't because red dwarfs are somehow special, simply that they are common. About 75% of the stars in the Milky Way are red dwarfs, so you would expect red ...
Astrobiology
Sep 20, 2024
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46
If you are going to look for intelligent life beyond Earth, there are few better candidates than the TRAPPIST-1 star system. It isn't a perfect choice. Red dwarf stars like TRAPPIST-1 are notorious for emitting flares and ...
Astrobiology
Sep 19, 2024
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31
As Russian missile strikes and heavy assaults by ground troops pace deadly attacks on Ukraine, a new report by University of Virginia researchers reveals another destructive facet of Russia's invasion.
Archaeology
Sep 19, 2024
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51
Are the biggest and most bulging calf muscles necessarily the most powerful? The scientists behind new research into muscle architecture say it's not the size of a muscle that delivers the most force, but rather its layout—in ...
Other
Sep 18, 2024
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43
For many decades, the coca plant—the main ingredient in cocaine—has been grown almost exclusively in South America. But a new study shows that nearly half of northern Central America appears to be highly suitable for ...
Environment
Sep 17, 2024
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67
The CMS experiment at CERN is the latest to weigh in on the mass of the W boson—an elementary particle that, along with the Z boson, mediates the weak force, which is responsible for a form of radioactivity and initiates ...
General Physics
Sep 17, 2024
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93
In a new study, MIT physicists propose that if most of the dark matter in the universe is made up of microscopic primordial black holes—an idea first proposed in the 1970s—then these gravitational dwarfs should zoom through ...
Astronomy
Sep 17, 2024
2
208
Physicists from the National University of Singapore (NUS) have achieved controlled conformational arrangements in nanostructures using a flexible precursor and selenium doping, enhancing material properties and structural ...
Nanophysics
Sep 16, 2024
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41
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
