Reference Terms
from Wikipedia, the free encyclopedia
Acceleration
In physics or physical science, acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second² using an accelerometer.
To accelerate an object is to change its velocity, which is accomplished by altering either its speed or direction (like in case of uniform circular motion) in relation to time. In this strict mathematical sense, acceleration can have positive and negative vals (deceleration). Any time that the sign (+ or -) of the acceleration is the same as the sign of the velocity, the object will speed up. If the signs are opposite, the object will slow down. Acceleration is a vector defined by properties of magnitude (size or measurability) and direction. When either velocity or direction are changed, there is acceleration (or deceleration)
Related Stories
1
2
Matter & Energy News
December 5, 2025
Dec. 5, 2025 Kyushu University scientists have achieved a major leap in fuel cell technology by enabling efficient proton transport at just 300°C. Their scandium-doped oxide materials create a wide, soft pathway that lets protons move rapidly without clogging ...
Dec. 5, 2025 Researchers engineered a strained germanium layer on silicon that allows charge to move faster than in any silicon-compatible material to date. This record mobility could lead to chips that run cooler, faster, and with dramatically lower energy ...
Dec. 4, 2025 Researchers have discovered a new way to grow graphene that deliberately adds structural defects to enhance its usefulness in electronics, sensors, catalysts, and more. Using a specially shaped molecule called azupyrene, scientists can produce ...
Dec. 2, 2025 A UC Irvine team uncovered a never-before-seen quantum phase formed when electrons and holes pair up and spin in unison, creating a glowing, liquid-like state of matter. By blasting a custom-made material with enormous magnetic fields, the ...
Dec. 1, 2025 Engineers have unlocked a new class of supercapacitor material that could rival traditional batteries in energy while charging dramatically faster. By redesigning carbon structures into highly curved, accessible graphene networks, the team achieved ...
Nov. 29, 2025 Quantum communication is edging closer to reality thanks to a breakthrough in teleporting information between photons from different quantum dots—one of the biggest challenges in building a quantum internet. By creating nearly identical ...
Nov. 28, 2025 Researchers have directly observed Floquet effects in graphene for the first time, settling a long-running scientific debate. Their ultrafast light-based technique demonstrates that graphene’s ...
Nov. 27, 2025 Researchers have discovered a low-energy way to recycle Teflon® by using mechanical motion and sodium metal. The process turns the notoriously durable plastic into sodium fluoride that can be reused directly in chemical manufacturing. This creates ...
Nov. 24, 2025 Europe is investing in a coordinated effort to develop high-power optical vortex technologies and train new specialists in the field. The HiPOVor network unites academia and industry to advance applications ranging from material processing to ...
Nov. 21, 2025 Scientists have directly measured the minuscule electron sharing that makes precious-metal catalysts so effective. Their new technique, IET, reveals how molecules bind and react on metal surfaces with unprecedented clarity. The insights promise ...
Nov. 21, 2025 Researchers have discovered a way to store information using a rare class of materials called ferroaxials, which rely on swirling electric dipoles instead of magnetism or charge. These vortex-like states are naturally stable and resistant to outside ...
Nov. 20, 2025 New research shows that light’s magnetic field is far more influential than scientists once believed. The team found that this magnetic component significantly affects how light rotates as it passes through certain materials. Their work challenges ...
Latest Headlines
updated 12:56 pm ET
Dec. 4, 2025 Penn State researchers created seven new high-entropy oxides by removing oxygen during synthesis, enabling metals that normally destabilize to form rock-salt ceramics. Machine learning helped ...
Nov. 29, 2025 The discovery of strange, ultra-red objects—especially the extreme case known as The Cliff—has pushed astronomers to propose an entirely new type of cosmic structure: black hole stars. These ...
Nov. 29, 2025 Nearly a century after astronomers first proposed dark matter to explain the strange motions of galaxies, scientists may finally be catching a glimpse of it. A University of Tokyo researcher ...
Nov. 29, 2025 ETH Zurich scientists have found the holy grail of brewing: the long-sought formula behind stable beer foam. Their research explains why different beers rely on different physical mechanisms to keep ...
Nov. 28, 2025 Using intense X-rays, researchers captured a buckyball as it expanded, split and shed electrons under strong laser fields. Detailed scattering measurements showed how the molecule behaves at low, ...
Nov. 26, 2025 Using a smart computational search, scientists discovered a catalyst ingredient that finally makes tough alkyl ketones behave the way chemists want. The reaction now runs cleanly and reliably, ...
Nov. 26, 2025 Researchers developed a powerful new manganese complex that could revolutionize light-driven chemical reactions. It absorbs light extremely efficiently, has a uniquely long excited-state lifetime, ...
Nov. 24, 2025 Using a precisely aligned pair of laser beams, scientists can now hold a single aerosol particle in place and monitor how it charges up. The particle’s glow signals each step in its changing ...
Nov. 22, 2025 Water trapped inside tiny molecular cavities behaves in a surprisingly energetic way, pushing outward like people crammed in an elevator. When a new molecule enters these narrow spaces, the confined ...
Nov. 22, 2025 Researchers discovered that copper oxide catalysts form metallic copper mid-reaction, triggering a dramatic boost in ammonia output. The insight offers a roadmap for designing cleaner, more efficient ...