Newton’s Law of Universal Gravitation. According to the Greeks, objects have a built-in desire to fall. They fall until they reach a lowest energy point. Here they are very stable.
PowerPoint Slideshow about 'Newtonâs Law of Universal Gravitation' - xena-henry
Download NowAn Image/Link below is provided (as is) to download presentation
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Newton compared the falling apple to the falling moon.
Remember that a projectile will move in a straight line unless acted upon by a force. Here the force is gravitational attraction of Earth. This is a centripetal force so the object is accelerated to the center of the Earth. The moon follows the straight line path but is pulled down as it travels over.
The moon falls in the sense that it falls below the straight line path that inertia would carry it on if no forces were acting on it.
He used a cannonball example to prove his point. In his thought experiment, he fires the cannonball with ever-increasing velocity. The cannonball eventually would have tangential velocity sufficient to carry it around the earth.
The distance that an object is from the center of the Earth affects its acceleration due to gravity. Earth’s radius is 6.38 x 106m. That is the average radius. If one is on a mountain that is very high, its height must be taken into consideration.
That means that you must add the radius of the Earth to the distance an object is above the surface.
If you are 2 Earth radii high, then your distance is 3 Earth radii.