Here's the breakdown:
* Newton's Law of Universal Gravitation: This law states that every particle in the universe attracts every other particle with a force that is proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
* Mass and Gravity: The more massive an object, the stronger its gravitational pull. Both your hand and the notebook have mass, so they exert a gravitational force on each other.
* Distance and Gravity: The closer two objects are, the stronger the gravitational force between them. Because your hand and notebook are very close together, the gravitational force between them is extremely small.
Why we don't feel it: The gravitational force between your hand and notebook is so incredibly tiny that it is completely overwhelmed by other forces, like the force of the Earth's gravity pulling both objects down. We don't notice this tiny force of attraction because it's insignificant compared to other forces acting on us.
