News tagged with force
Air Force spaceplane aims for June landing
(AP) — An unmanned U.S. Air Force spaceplane that has been in orbit for over a year is coming back to Earth.
Space & Earth / Space Exploration
10 hours ago |
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Double quake highlights Italy's seismic perils
Two killer earthquakes that struck northeastern Italy in nine days have shed light on the brutal but complex seismic forces that grip the Italian peninsula, scientists say.
Space & Earth / Earth Sciences
May 29, 2012 |
4 / 5 (1) |
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Facebook deflates any thought of new tech bubble
The horrendous stock market debut for Facebook suggests investors are not ready to jump in and create another tech bubble despite big expectations for social media, analysts say.
May 28, 2012 |
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A new way to discover pulsars
(Phys.org) -- The Large Area Telescope (LAT), built by SLAC for the Fermi Gamma-ray Space Telescope, collects information on high-energy gamma rays from numerous sources in the sky. Among these are small, ...
May 22, 2012 |
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Cassini spots tiny moon, begins to tilt orbit
(Phys.org) -- NASA's Cassini spacecraft made its closest approach to Saturn's tiny moon Methone as part of a trajectory that will take it on a close flyby of another of Saturn's moons, Titan. The Titan flyby ...
Space & Earth / Space Exploration
May 22, 2012 |
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Synthetic scent hounds: Nanostructured sensor for detection of very low concentrations of explosive
To prevent terrorist attacks at airports, it would be helpful to detect extremely low concentrations of explosives easily and reliably. Despite the development of various sensor technologies, dogs continue ...
May 18, 2012 |
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SpaceX readies ambitious ISS launch
California-based company SpaceX was poised to launch its Dragon capsule to the International Space Station Saturday in what may be a historic mission for private spaceflight.
Space & Earth / Space Exploration
May 18, 2012 |
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SpaceX poised for high-stakes space station launch
SpaceX on Saturday aims to become the first private company to send its own cargo ship to the International Space Station, a feat that only a handful of world governments have pulled off.
Space & Earth / Space Exploration
May 17, 2012 |
5 / 5 (5) |
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Key facts about SpaceX
Space Exploration Technologies is the first private company to attempt to send its own cargo capsule to the International Space Station and back.
Space & Earth / Space Exploration
May 22, 2012 |
5 / 5 (4) |
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Energy in action: For two molecules on blind date, new method predicts potential for attraction or repulsion
(Phys.org) -- Krzysztof Szalewicz, professor of physics and astronomy at the University of Delaware, and Rafal Podeszwa of the University of Silesia Institute of Chemistry in Poland have developed and validated ...
May 16, 2012 |
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DNA as invisible ink can reversibly hide patterns
(PhysOrg.com) -- While most people know of DNA as the building blocks of life, these large molecules also have potential applications in areas such as biosensing, nanoparticle assembly, and building supramolecular ...
Nanotechnology / Bio & Medicine
Jan 23, 2012 |
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Scientists evaluate different antimicrobial metals for use in water filters
Porous ceramic water filters are often coated with colloidal silver, which prevents the growth of microbes trapped in the micro- and nano-scale pores of the filter. Other metals such as copper and zinc have also been shown ...
Nanotechnology / Bio & Medicine
May 24, 2012 |
4 / 5 (1) |
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Eye on ionization: Visualizing and controlling bound electron dynamics in strong laser fields
(PhysOrg.com) -- Subatomic events can be remarkably counterintuitive. Such is the case in theoretical physics when, under certain specific conditions, atoms exposed to intense infrared laser pulses remain ...
Oct 19, 2011 |
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Lighten up: Polaritons with tunable photon-exciton coherence
(PhysOrg.com) -- Of the many exotic and counterintuitive aspects of particle and quantum physics, exciton and polariton quasiparticles are among the most interesting. An exciton forms when a photon is absorbed ...
Jun 14, 2011 |
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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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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.
