A study by the University of Southampton has found that market forces have provided good food price stability over the past half century, despite extreme weather conditions.
Economics & Business
Apr 11, 2024
0
7
Voids, or empty spaces, exist within matter at all scales, from the astronomical to the microscopic. In a new study, researchers used high-powered microscopy and mathematical theory to unveil nanoscale voids in three dimensions. ...
Nanomaterials
Apr 11, 2024
0
583
In an article published in Nature Communications, an international team led by researchers from the Nanodevices group at CIC nanoGUNE succeeded in voltage-based magnetization switching and reading of magnetoelectric spin-orbit ...
Nanophysics
Apr 10, 2024
0
9
In a study led by Prof. Wei Xu (Interdisciplinary Materials Research Center, School of Materials Science and Engineering, Tongji University) and published in the journal National Science Review, a research team achieved the ...
Analytical Chemistry
Apr 8, 2024
0
1
Scientists at NPL worked with Diamond Light Source to publish a study that shows how the chemistry of human cells changes, depending on the structure of their extracellular niche, are major determinants of cell responses ...
Biochemistry
Apr 5, 2024
0
48
Astronomers are pretty sure they know where the moon came from. In the early solar system, a Mars-sized object dubbed Theia smashed into Earth. This cataclysmic collision knocked a huge mass of material into orbit, which ...
Planetary Sciences
Apr 4, 2024
1
37
Plants are made up of very rigid cells. Much like bricks in a wall, this feature gives them the structural support to maintain their shape and to stand upright against gravity. However, just like any living organism, plants ...
Plants & Animals
Apr 4, 2024
1
21
The shearing of fluids—meaning the sliding of fluid layers over each other under shear forces—is an important concept in nature and in rheology, the science that studies the flow behavior of matter, including liquids ...
General Physics
Apr 4, 2024
0
74
Researchers from The Australian National University (ANU) have made a discovery about a little understood protein in the human body that could help treat diseases that cause seizures, including epilepsy. The study is published ...
Cell & Microbiology
Apr 4, 2024
0
3
An international team of astronomers and astrophysicists has confirmed the first known observance of a tidally locked super-Earth exoplanet. In their paper published in The Astrophysical Journal, the group describes the unique ...
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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