What is "g" related to physics?

Answer 1

g normally stands for the acceleration of a falling body due to gravity. The g value varies depending on where the falling body is located. On the surface of the Earth, for example, g = 32.2 ft/sec^2 = 9.81 m/sec^2. On the surface of the Moon, where the force of gravity is less than that on Earth, g = (1/6) 9.81 ~ 1.6 m/sec^2 or 1/6 the acceleration of a body falling on Earth.

g is frequently treated as a constant in the equation W = mg; where W is the weight of a body with mass m. A constant g will give reasonably correct answers so long as the distance the body is falling is not too great. But when dropping a body from great heights, g cannot be considered constant if you are looking for precise answers.

For example, if we let a rock fall from several thousand of miles from the surface of the Earth, g out there would be somewhat less than 9.81 m/sec^2, which is g on the surface. But as the rock fell closer and closer to the surface (assuming it doesn't burn up on reentry into the atmosphere), g would get larger and larger until it reached about 9.81 m/sec^2 at the Earth's surface.

Note that g does not represent the acceleration a falling body might actually experience unless the body is in a vacuum. In an atmosphere, the actual acceleration could be somewhat less than g due to drag forces acting on the body to slow it down.

Answer 2

"g" is gravity related to physics.
In physics, gravitation or gravity is the tendency of objects with mass to accelerate toward each other.

(Earth's gravity:

Every planetary body, including the Earth, is surrounded by its own gravitational field, which exerts an attractive force on any object that comes under its influence. This field is proportional to the body's mass and varies inversely with the square of distance from the body. The gravitational field is numerically equal to the acceleration of objects under its influence, and its value at the Earth's surface, denoted g, is approximately 9.81 m/s² or 32.2 ft/s². This means that, ignoring air resistance, an object falling freely near the earth's surface increases in speed by 9.81 m/s (around 22 mph) for each second of its descent. Thus, an object starting from rest will attain a speed of 9.81 m/s after one second, 19.62 m/s after two seconds, and so on. According to Newton's 3rd Law, the earth itself experiences an equal and opposite force to that acting on the falling object, meaning that the earth also accelerates towards the object. However, because the mass of the earth is huge, the acceleration produced on the earth by this same force is negligible.)

According to the law of universal gravitation, the attractive force between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them.

F=-G*m1*m2/r^2
The constant of proportionality is called G, the gravitational constant, the universal gravitational constant, Newton's constant, and colloquially big G. The gravitational constant is a physical constant which appears in Newton's law of universal gravitation and in Einstein's theory of general relativity. In some other theories the constant is replaced with a scalar value. See Rosen bi-metric theory of gravity.

Answer 3

The acceleration due to Gravity near the surface of the Earth.

Answer 4

Yes. 'g' referring to gravity is a constant in physics.

Answer 5

'g' in physics denotes the acceleration due to gravity ;the acceleration with which all free falling bodies move towaerds the surface of the earth;its value at a place is same for all bodies.
Standard value of g is 9.8m/sec.sec

Answer 6

Conventionally "g" is used to designate acceration due to gravity or constant for the Newton's law of universal greavitation(but usually in capital)

Answer 7

Gravity : 9.8 meter per second / squared, the rate in which something falls.

Answer 8

g refers to the force of gravity, which I think is a constant, but I can't remember the number.

Answer 9

I believe that "g" stands for gravity or gravities depending on what your problem refers to.

Answer 10

Yep. G = gravity.