Business
Technological innovation in the last couple of decades has brought fame and huge wealth to the likes of Elon Musk, Steve Jobs, Mark Zuckerberg and Jeff Bezos. Often feted as geniuses, they are the faces behind the gadgets ...
Dec 29, 2023
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Energy & Green Tech
A research team from the School of Engineering of the Hong Kong University of Science and Technology (HKUST) has shown the existence of surface concavities on individual crystal grains, which are the fundamental building ...
Jul 19, 2024
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24
Sailing used to be considered as a rather sedate pastime. But in the past few years, the world of yacht racing has been revolutionised by the arrival of hydrofoil-supported catamarans, known as "foilers". These vessels, more ...
Sep 19, 2019
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6
Robotics
Eating a meal involves multiple precise movements to bring food from plate to mouth.
Apr 12, 2023
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51
Robotics
Hacked bank and Twitter accounts, malicious power outages and attempts to tamper with medical records threaten the security of the nation's health, money, energy, society and infrastructure. Harnessing the laws of nature—namely ...
May 25, 2022
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293
Engineering
Lithium-metal (Li-metal) batteries show great potential for packing more significant amounts of energy than the current lithium-ion batteries. For example, a Li-metal electric battery in a car could travel more miles, and ...
Mar 22, 2022
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53
Robotics
Thanks to their swimming robot modeled after a lamprey, EPFL scientists may have discovered why some vertebrates are able to retain their locomotor capabilities after a spinal cord lesion. The finding could also help improve ...
Aug 12, 2021
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407
Security
The use of facial recognition technology by British police has violated human rights and data protection laws, a court said Tuesday, in a decision praised as a victory against invasive practices by the authorities.
Aug 11, 2020
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6
Robotics
In the future, smart textile-based soft robotic exosuits could be worn by soldiers, fire fighters and rescue workers to help them traverse difficult terrain and arrive fresh at their destinations so that they can perform ...
Sep 17, 2018
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33
Hardware
Defective computer chips are the bane of the semiconductor industry. Even a seemingly minor flaw in a chip packed with billions of electrical connections might cause a critical operation in a computer or other sensitive electronic ...
Nov 4, 2022
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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
