1 gram force equals
(acceleration due to gravity g=9.8ms2)
One gram force(gf) is the force due to gravity on a mass of 1 g.
one gram = 0.001 kg
Force due to gravity on one gram mass =0.001×9.8=0.0098N
1newton=105dyne
So, 1gram force (1gf) =0.0098×105
1gf=980dyne