News tagged with force
Nature's laws may vary across the Universe
(PhysOrg.com) -- One of the laws of nature may vary across the Universe, according to a study published today in the journal Physical Review Letters.
Oct 31, 2011 |
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Serious blow to dark matter theories? New study finds mysterious lack of dark matter in Sun's neighborhood
(Phys.org) -- The most accurate study so far of the motions of stars in the Milky Way has found no evidence for dark matter in a large volume around the Sun. According to widely accepted theories, the solar ...
Apr 18, 2012 |
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A big surprise from the edge of the solar system: magnetic bubbles (w/ video)
(PhysOrg.com) -- NASA's Voyager probes are truly going where no one has gone before. Gliding silently toward the stars, 9 billion miles from Earth, they are beaming back news from the most distant, unexplored ...
Space & Earth / Space Exploration
Jun 09, 2011 |
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Antigravity could replace dark energy as cause of Universe's expansion
Since the late 20th century, astronomers have been aware of data that suggest the universe is not only expanding, but expanding at an accelerating rate. According to the currently accepted model, this accelerated ...
Apr 18, 2011 |
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New planet discovered in Trinary star system
Until recently, astronomers were highly skeptical of whether or not planets should be possible in multiple star systems. It was expected that the constantly varying gravitational force would eventually tug ...
Jul 14, 2011 |
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Bacteria can grow under extreme gravity: study
(PhysOrg.com) -- A new study in the Proceedings of the National Academy of Sciences shows that bacteria is capable of growing under gravity more than 400,000 times that of Earth and gives evidence that the th ...
Apr 26, 2011 |
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NASA OKs Feb. launch of private space station trip
A private California company will attempt the first-ever commercial cargo run to the International Space Station in February.
Space & Earth / Space Exploration
Dec 09, 2011 |
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Future NASA mission to sun 'a life's dream' for some
The chest-high rack of electronics Justin Kasper is assembling in a Massachusetts office park will fit in a shoe box before he's done.
Space & Earth / Space Exploration
Mar 16, 2012 |
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Northwestern research team turns theory of static electricity on its head
(PhysOrg.com) -- Bartosz Grzybowski, a physical chemist at Northwestern University, and his team of colleagues offer evidence in a paper published in Science, that shows that what scientists have believed to be ...
Jun 29, 2011 |
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It takes three to tango: Nuclear analysis needs the three-body force
(PhysOrg.com) -- The nucleus of an atom, like most everything else, is more complicated than we first thought. Just how much more complicated is the subject of a Petascale Early Science project led by Oak ...
Jul 13, 2011 |
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Runaway planets zoom at a fraction of light speed
Seven years ago, astronomers boggled when they found the first runaway star flying out of our Galaxy at a speed of 1.5 million miles per hour. The discovery intrigued theorists, who wondered: If a star can ...
Mar 22, 2012 |
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Inspired by gecko feet, scientists invent super-adhesive material
For years, biologists have been amazed by the power of gecko feet, which let these 5-ounce lizards produce an adhesive force roughly equivalent to carrying nine pounds up a wall without slipping. Now, a team ...
Feb 16, 2012 |
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The constants they are a changin': NIST posts latest adjustments to fundamental figures
The electromagnetic force has gotten a little stronger, gravity a little weaker, and the size of the smallest "quantum" of energy is now known a little better. The National Institute of Standards and Technology ...
Jul 20, 2011 |
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'Anonymous' hackers target US security think tank
Hackers with the loose-knit movement "Anonymous" claimed on Sunday to have stolen a raft of emails and credit card data from U.S.-based security think tank Stratfor, promising it was just the start of a weeklong, ...
Dec 25, 2011 |
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'Flying carpet': Princeton team's plastic sheet can hover above ground (w/ video)
(PhysOrg.com) -- A thin sheet of plastic has been making headlines at Princeton as a magical flying carpet, after the publication of a paper describing experiments by the team with their prototype sheet of ...
Oct 01, 2011 |
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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.
For more information about Force, read the full article at
Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.
