Gravity seems to be weakest among the four fundamental forces. Scientist struggles to find out the reason behind that.
There are four fundamental forces in the universe.
The Strong Force
Gravity is so weak even though that generates from a large masses such as our planet. For an example entire earth cannot pull down small nail which is attached to a small magnet even if it is hanging above few centimeters from the ground.
Scientist those who study the String Theories, explain gravity might be leaking to other dimensions. I have started a video series explaining some of the concepts in other dimensions. So using the same principles I was trying to describe this phenomena for those who interest in this subject area in a very simple explanations. Please watch the above vide for more details.