Question

why does gravitational force dominate all terrestrial phenomenon although electromagnetic force os much stronger than gravitational force?

Answer 1

it is because gravitational forces always adds up(always attractive) whereas em forces may cancel each other (attractive and repulsive).
as both (+)ve and (-ve) charges are present , they tend to cancel each other's effect ,so there is negligible em force in compared to gravitational force , when adds up to huge values due to large masses of terrestrial bodies

Answer 2

Answer:because mass comes in one variety(no -ve mass) but charge comes in two varieties i.e. +ve & -ve which makes all difference. EM force can be attractive & repulsive both whereas Gravity always attractive.

Matter is mostly electrically neutral i.e. net charge is zero hence Electric force is zero and this is why Gravitational force dominates terrestrial phenomena.

Explanation: