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The property of an object that determines how much it responds to a force in Newtonian mechanics, and how much it interacts with gravity in the Newtonian framework. Mass also refers to the intrinsic energy of a particle in particle physics. This tag does also cover effective mass.

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What is the mass of a photon moving at the speed of light?

A photon has no rest mass, that is to say if you could stop it, it would have zero mass. … As it is always moving at c (unless in a dielectric material) it has some effective mass which would experience acceleration in a gravitational field. …
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2 votes

Do photons actually generate a slight kinetic force?

Photons can exert force on matter, a phenomenon known as radiation pressure. However it is not the kinetic energy of a photon which excites atomic electrons into higher orbits. Instead the photon has …
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