Force

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Physicists confirm possible discovery of fifth force of nature (Phys.org)
A Fifth Force: Fact or Fiction? (Don Lincoln, Senior Scientist, Fermi National Accelerator Laboratory, Live Science)

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force : any of the natural influences (as electromagnetism, gravity, the strong force, and the weak force) that exist especially between particles and determine the structure of the universe — Webster

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Forces in the universe are based on four fundamental interactions. The strong and weak forces are nuclear forces that act only at very short distances, and are responsible for the interactions between subatomic particles, including nucleons and compound nuclei. The electromagnetic force acts between electric charges, and the gravitational force acts between masses. All other forces in nature derive from these four fundamental interactions. For example, friction is a manifestation of the electromagnetic force acting between the atoms of two surfaces, and the Pauli exclusion principle, which does not permit atoms to pass through each other. Similarly, the forces in springs, modeled by Hooke’s law, are the result of electromagnetic forces and the Exclusion Principle acting together to return an object to its equilibrium position. Centrifugal forces are acceleration forces that arise simply from the acceleration of rotating frames of reference — Wikipedia

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Introduction to Forces (Practical Physics)

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The story of force: from Aristotle to Einstein (Arthur Stinner)

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Physics News -- ScienceDaily Physics News and Research. Why is the universe more partial to matter than antimatter? How could fuel cells be more efficient? Read current science articles on physics.

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    on November 22, 2017 at 6:14 pm

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    on November 22, 2017 at 6:13 pm

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    on November 22, 2017 at 6:13 pm

    Researchers find that lightning strikes causes photonuclear reactions in the atmosphere, creating antimatter. […]

  • Dark matter and dark energy: Do they really exist?
    on November 22, 2017 at 4:30 pm

    Researchers have hypothesized that the universe contains a 'dark matter.' They have also posited the existence of a 'dark energy.' These two hypotheses account for the movement of stars in galaxies and for the accelerating expansion of the universe. But, according to a researcher, these concepts may be no longer valid: the phenomena can be demonstrated without them. This research exploits a new theoretical model based on the scale invariance of the empty space. […]

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    on November 21, 2017 at 6:25 pm

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