1. Mass of the objects: The more massive the objects, the stronger the gravitational force between them.

2. Distance between the objects: The closer the objects are, the stronger the gravitational force between them.

Think of it this way: Imagine a giant magnet. The bigger the magnet, the stronger its pull. That's like the mass of an object. Now, imagine you're holding a small metal object close to the magnet. It gets pulled towards the magnet strongly. Move the object further away, and the pull weakens. That's like the distance between objects.