Question

dear /miss what is the difference between small g and big G?

Answer 1

'g' is the acceleration due to gravity, while 'G' is the Universal Gravitational Constant. 
The value of 'g' is 9.8m/s² on Earth, and the value of 'G' is 6.673*10¹¹ Nm²/kg² .

Answer 2

there is a very big difference between g and G..
small g is the acceleration due to gravity..in which particle is thrown on the surface of earth have acceleration .which is equal to g...small g can vary place to place..and it is zero at the centre of earth and it is maximum at the equator of earth...
but G is the constant quantity..termed as universal constant its value never change..anywhere in the universe..
so there is huge difference between g and G..