According to string theorists' best ideas, gravity is so weak because, unlike the other forces, it leaks in and out of these extra dimensions. ... The proof of this might come through experiments that probe the gravitational attraction between objects that are very small distances apart.

What makes gravitational forces weaker?

Objects with more mass have more gravity. Gravity also gets weaker with distance. So, the closer objects are to each other, the stronger their gravitational pull is.

Is gravitational force the weakest force in nature?

Among the 4 fundamental forces of nature, Gravity or gravitational force is the weakest force in nature. It is weaker than other forces like electromagnetic, weak magnetic and strong magnetic. So, it is considered to be one of the weakest forces.