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Asked by Himanshu

Sep 20, 2013

What is difference between 'g' and 'G'

What is difference between 'g' and 'G'

Answers(4)

Answer

Syeda

Member since Jan 25, 2017

Answer.

g is the gravitational force exerted by any planet. For earth it's 9.8m/s2. G can be g but g cannot be G.

Salar Khalid

g 1=acceleration due to gravity
2=varies from place to place
3=SI unit is ms-2
G unviersal Gravitational constant
1= it is universal constan
2= constant everywhere on earth
3=its SI unit is NM2KG-2

Amarnathreddy M

Member since Jul 9, 2013

G stands for Newton's universal gravitational constant, whereas g stands for the acceleration due to gravity at a certain point.
G = 6.67300 × 10-11 N.m2.kg-2, G is a constant throughout space and time and it is a scalar quantity.
g = 9.8 m.s-2,   g is acceleration due to gravity which is a variable quantity and a vector qualtity. 
 
According to Newton's law of universal gravitation the force of attraction between two bodies is given by
F = GMm/r
2 ---------- (i)

From Newton's second law of motion the weight of a body of mass m is

F = mg -----------------(ii)


From (i) and (ii)
mg = 
GMm/r2
or
g = GM/r
2

Note:
g is a constant at a given location, which depends upon M and r.

Alexandria

G is the universal constant of gravitation. As we know that every body in the universe exerts a force on every other body, so the force exerted by it has a constant i.e. G which is 6.67 × 10-11 kg-1 s-2. 

g is the gravitational force exerted by any planet. For earth it's 9.8m/s2. G can be g but g cannot be G.

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