The single most important force in the universe is gravity. Gravity is a force that attracts a body toward the center of the earth, or toward any other physical body having mass. For most purposes Newton's laws of gravity apply, with minor modifications to take the general theory of relativity into account. Gravity depends upon the distance between the bodies being attracted to each other and the amount of matter in each of those bodies. The mass between those bodies must be similar, for example two objects or particles with nonzero mass tend to attract one another because of gravity. In addition, it is the force that holds the planets in orbit around the sun and moon(s) in orbit around their planets. It is responsible for the ocean tides, which is the catalyst from the gravitational pull on the moon. Thus gravity had many liabilities for the universe and results in many different reactions occurring daily. …show more content…
The first law was the law of inertia, which was already explained. The second law of motion was published in 1687, in which he formalized the description of how massive bodies move under the influence of external forces. This expanded on Galileo's idea who developed the first accurate laws of motion for masses. The second law says that when a constant force acts on a massive body, it causes it to accelerate. If an object is in motion prior or the situation is observed from a moving inertial reference frame, that body may appear to speed up, slow down, or change direction. This would depend upon the direction of the force and directions that the reference frame and object are moving relative to each other. In a simpler situation, when a force is applied to an object at rest it results in an acceleration of the object in the direction of that force. Thus concluding that the universe followed a series of natural