(From a note to my class folder after a lab writeup:)
|From NASA: Recognize the guy in "zero g"? (Or *is* he|
in "zero g"?)
The variable g represents the gravitational field, which near earth is 10 N/kg.
Or, the variable g represents the free-fall acceleration, which on earth is 10 m/s2.
The variable g does NOT represent the "force of gravity" or the "gravitational pull." The force of gravity on an object is the object's weight, or mg.
The variable g does NOT represent the "free-fall velocity." Such a thing does not exist.
And finally, the variable g does not mean "gravity." That's ambiguous -- lost of quantities are associated with this nebulous thing called gravity. There's gravitational field and free-fall gravitational acceleration, but also gravitational force, gravitational potential energy, and the universal gravitation constant.