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  2. Negative mass - Wikipedia

    en.wikipedia.org/wiki/Negative_mass

    In theoretical physics, negative mass is a hypothetical type of exotic matter whose mass is of opposite sign to the mass of normal matter, e.g. −1 kg. [1] [2] Such matter would violate one or more energy conditions and exhibit strange properties such as the oppositely oriented acceleration for an applied force orientation.

  3. Effective mass (solid-state physics) - Wikipedia

    en.wikipedia.org/wiki/Effective_mass_(solid...

    One remarkable property is that the effective mass can become negative, when the band curves downwards away from a maximum. As a result of the negative mass , the electrons respond to electric and magnetic forces by gaining velocity in the opposite direction compared to normal; even though these electrons have negative charge, they move in ...

  4. Exotic matter - Wikipedia

    en.wikipedia.org/wiki/Exotic_matter

    Negative mass would possess some strange properties, such as accelerating in the direction opposite of applied force.Despite being inconsistent with the expected behavior of "normal" matter, negative mass is mathematically consistent and introduces no violation of conservation of momentum or energy.

  5. Matter - Wikipedia

    en.wikipedia.org/wiki/Matter

    While there are different views on what should be considered matter, the mass of a substance has exact scientific definitions. Another difference is that matter has an "opposite" called antimatter, but mass has no opposite—there is no such thing as "anti-mass" or negative mass, so far as is known, although scientists do discuss the concept ...

  6. Anti-gravity - Wikipedia

    en.wikipedia.org/wiki/Anti-gravity

    Notice that because the negative mass acquires negative kinetic energy, the total energy of the accelerating masses remains at zero. Forward pointed out that the self-acceleration effect is due to the negative inertial mass, and could be seen induced without the gravitational forces between the particles. [19]

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  8. 2024 has been a nerve-wracking year for plane travel. How ...

    www.aol.com/finance/2024-nerve-wracking-plane...

    Anxious airline flyers may well remember 2024 as the year their worst fears about the safety of air travel felt confirmed, as a series of unprecedented, and in some cases fatal, airplane incidents ...

  9. Negative energy - Wikipedia

    en.wikipedia.org/wiki/Negative_energy

    Since the ergosphere is outside the event horizon, particles can escape from it. Within the ergosphere, a particle's energy may become negative (via the relativistic rotation of its Killing vector). The negative-energy particle then crosses the event horizon into the black hole, with the law of conservation of energy requiring that an equal ...