Major objective of this lecture is to present on Gravity. Gravity is a natural force that pulls all objects toward the center of the earth. It is a force pulling together all matter (which is anything you can physically touch). The more matter, the more gravity, so things that have a lot of matter such as planets and moons and stars pull more strongly. Gravity is one of the four fundamental forces, along with the electromagnetic, strong and weak forces.
Lecture on Gravity
