• • You may have heard about the law of gravity. Or to be more specific, Newtonâ€™s law of universal gravitation. It is a theory that has been around for hundreds of years, but interestingly enough it was not tested for nearly a century. However, as you can see in the law of gravity PowerPoint diagram, the theory is simple enough, even if it is somewhat complicated to explain.

### How it Works

The law of gravity as formulated by Sir Isaac Newton in his work, â€œPhilosophiae Naturalis Principia Mathematicaâ€ which was published on July 5th, 1686, states that a particle will attract every other particle in the universe with its force that is proportional to the product found in its mass. Plus, it is inversely proportional to the square of the distances between the centers of each particle.

To put it another away, each point of mass attracts all other points of mass by a force that is pointing on the line that intersects both points. The force is proportional to the product or sum of the two masses, yet inversely proportional to the square of the distance that is found between them. It is a law which is similar to Coulombâ€™s Law of Electrical Forces, which is used to add up the magnitude of electrical forces between two bodies that are charged.

### How the Law of Gravity Came About

The legend about how Sir Isaac Newton discovered his law of gravity is perhaps more famous than the law itself. The story goes that Newton was sitting under an apple tree when a ripe apple detached itself from the branch and fell on Newtonâ€™s head. It was at that point where Newton began to formulate his theory on gravity.

There is no evidence that the event happened the way the story is told. However, it is believed that Newton saw an apple fall from a tree and from that he began to think about the effects of gravity. In this case, it was the apple that started with zero motion suddenly falling to the earth. For a body to go into motion, a force must be applied to it as per Newtonâ€™s second law of motion.

Furthermore, Newton realized that the force of gravity applied even if the apple was higher up the tree or if the tree was taller. He then postulated that the force of gravity extended all the way to the moon, which was being held in orbit around the Earth by gravity. Since mass determines the acceleration and the acceleration of the Earth must also be upwards, it was that realization which brought about Newtonâ€™s law about how gravity works.

Newtonâ€™s law of gravity has been superseded by the theory of general relativity as created by Albert Einstein. However, the law of gravity by Sir Isaac Newton is still being used to demonstrate the effects of gravity where it is being applied. Only under certain conditions does Einsteinâ€™s theory apply, so as shown in the law of gravity PowerPoint diagram, there is still much to be gained by the use of Newtonâ€™s law of gravity.

The force of gravity is the most present and prominent physical law and force on our planet, responsible for keeping life tethered to the ground and able to thrive at all. Gravity can be an interesting topic to teach, but when you are first exploring it with your students, it can be quite a concept to grasp when it comes to exactly how it works. The Gravity PowerPoint Diagram intends to make that easier on your pupils by showing you the way it works in a diagram to serve as a visual aid. This Gravity PowerPoint Diagram features two different slides that are fully editable and customizable. These slides offer you the chance to change the colors, text and any icons you want to put on them.

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• 2 Fully editable PowerPoint slides