Engineering

Pentagon debuts its new stealth bomber, the B-21 Raider

America's newest nuclear stealth bomber is making its public debut after years of secret development and as part of the Pentagon's answer to rising concerns over a future conflict with China.

Robotics

Soft robots make virtual reality gloves feel more real

Soft robots, or those made with materials like rubber, gels and cloth, have advantages over their harder, heavier counterparts, especially when it comes to tasks that require direct human interaction. Robots that could safely ...

Automotive

EU threatens US over electric car subsidies

The European Union threatened Monday to take retaliatory measures against the United States for electric car subsidies that favor domestic manufacturers.

Automotive

EU, US set up task force to resolve electric vehicle feud

The U.S. and the European Union have set up a task force tasked with resolving a dispute over electric vehicle batteries that the EU says would discriminate against manufacturers in the 27-nation bloc and break World Trade ...

Energy & Green Tech

How does this professor's garden grow? On a Denver rooftop

Colorado State University professor Jennifer Bousselot is growing a garden on top of a building in Denver as part of her ongoing research into "green roofs" and her efforts to educate the public about their many benefits.

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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.

This text uses material from Wikipedia, licensed under CC BY-SA