why is gravitational potential negative

The potential has units of energy per mass, e.g., J/kg in the MKS system. The object would gain potential energy if moved away from the Earth. By convention, it is always negative where it is defined, and as x tends to infinity, it approaches zero..
“Infinity”, meaning as far as possible from all masses, is often chosen as zero potential, and there is no higher potential than infinity. In physics, potential energy is the energy held by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.

Now we say that if it is really, really, really far away, it has 0 J of gravitational potential energy. where G is the gravitational constant, and F is the gravitational force. 1 (a) Define gravitational potential. Gravitational Potential Energy. Get an answer for 'Why the gravitational potential is always negative.Please give reason,not the mathematical expression. Gravitational potential is the gravitational potential energy… Gravitational potential is negative because you have to do wor… Gravitational potential energy is also negative. This means that if something is on the surface of Earth, it would have a large, but negative, amount of gravitational potential energy. [3] (c) The Earth may be assumed to be an isolated sphere of radius 6.4 ×103 km with its mass of 6.0×1024kg concentrated at its centre.An object is projected vertically from the surface of the Earth so that it reaches an altitude of 1.3×104km.
But it has zero potential energy at infinity. So relative to infinity, all gravitational potentials are negative. The gravitational potential energy of a body depends on the reference point for measurement. Hence it must have negative potential energy when closer to Earth than infinity. [2] (b) Explain why values of gravitational potential near to an isolated mass are all negative. the first, mgh is the gravitational potential energy in a constant field, while the second gives the GPE in a gravity field which decreases according to the inverse square law. Potential energy is measured relative to an arbitrary zero reference point. Neither are less valid in principle, it depends on the gravitational field under consideration. Physics' and find homework help for other Science questions at eNotes

This part is okay. The general expression for gravitational potential energy arises from the law of gravity and is equal to the work done against gravity to bring a mass to a given point in space.


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