​Photons Have No Inertial Mass and No Relativistic Mass​ According to Einstein’s theory of special relativity, any object with rest mass gains relativistic mass as it increases in momentum, and if something were to reach the speed of light, it would have infinite mass.

Photons, whether they are particles or waves seem not to interact with this field at all acording to their speed, however they are still affected by gravity. The other particles, lacking rest mass, still have inertial mass, which is identical to gravitational mass.

Ordinary matter primarily interacts via the electromagnetic force: electrons repel each other and are attracted to protons, thanks to their electrical charges. Photons, on the other hand, are both electrically neutral and massless in free space.

According to theory of properties of photon, they can not be affected by electric and magnetic fields and it is neutral.

The electromagnetic interaction is mediated by the constant exchange of photons from one charged object to another. The magnetic field is really just a classical approximation to the photon-exchange picture. Electrostatic and magnetic fields involve the exchange of “virtual” photons instead.

Photons are made of magnetic (rather, electromagnetic) fields. To be specific, photons are ripples in the electromagnetic field. Electron ripples carry charge, so they interact with the electromagnetic field, and they disturb each other and apply forces to each other.

Gravity is not affected at all by Earth’s magnetic field, because gravity is the attractive force of the mass of two objects, which is unrelated to magnetism. However, the interaction between the magnetic field and these particles deflects them around the Earth.

Which force is stronger: gravity, or magnetism? To be exact, gravity is 137-times stronger than magnetism *at the planetary level*.

Actually, gravity is the weakest of the four fundamental forces. Ordered from strongest to weakest, the forces are 1) the strong nuclear force, 2) the electromagnetic force, 3) the weak nuclear force, and 4) gravity.

Yes. Free fall is defined as “any motion of a body where gravity is the only force acting upon it.” In the vacuum of space, where there are no air molecules or supportive surfaces, astronauts are only acted upon by gravity. Thus, they are falling towards Earth at the acceleration of gravity.

The speed achieved by a human body in free fall is conditioned of two factors, body weight and body orientation. In a stable, belly to earth position, terminal velocity of the human body is about 200 km/h (about 120 mph).

When in free fall, the only force acting upon your body is the force of gravity – a non-contact force. Since the force of gravity cannot be felt without any other opposing forces, you would have no sensation of it. As such, you would experience a weightless sensation.