PPT-Newton and Gravity

Isaac Newton 16421727 Galileo found that bodies with different masses experienced the same acceleration when dropped to the ground But he didnt know why Kepler discovered that the motions of the planets were perfectly reproduced by 3 mathematical relations Like Galileo . Claudius Ptolemy . –. 87 . –. 150 CE. Nicholas Copernicus . –. 1473 . –. 1543. Galileo . Galilei. . –. 1564 . –. 1642. Johannes . Kepler. . –. 1571 . –. 1630. Isaac Newton . Einstein and Newton. 1. Newtonian Gravity. Newton explains the universe using forces. 2. Newton. Newtonian gravitational theory is based on forces acting on one another.. An object at rest stays at rest and an object in motion stays in motion (in a straight line) until acted upon by another force.. 4. – Newton and Einstein. ASTR 101. Prof. Dave Hanes. Newton . Succeeds!. The orbit of (newly-discovered) Uranus. Halley. ’. s comet (and others, later). The prediction of Neptune. The prediction of Pluto . Motion. Lesson 15. February 8. th. , 2011. Newton’s Second Law of Motion. If the external force on an object is not zero, the objet accelerates in the direction of the net fore. The magnitude of the acceleration is directly proportional to the net force and inversely proportional to the objects mass. . ASTR 101. Prof. Dave Hanes. Orbiting Near, Around, . and Away from the Earth. Let’s consider:. Ballistic missiles on Earth. Artificial satellites. Geosynchronous satellites. Actually escaping the Earth. ’. s law of . universal gravitation. :. where:. F is the force of gravitation.. m. 1. and m. 2. are the masses.. r is the distance between the masses.. . . is the gravitational constant that is equal to 6.67x10. Astronomy, Chapter 2. D Taylor. © 2011, 2012, 2013,2014. Gravity and Motion. 2. Introduction. Gravity. gives the Universe its structure. It is a universal force that causes all objects to pull on all other objects everywhere. Earth, Moon, and Sun Gravity and Motion Isaac Newton was the first scientist to explain what keeps the Earth and Moon in orbit Force – a push or a pull There is a force acting between the Earth and the moon that keeps them in orbit Newton’s Law of Gravitation Applications of Circular Motion Bellwork 01/19/11 A 1.50-kg bucket of water is tied by a rope and whirled in a circle with a radius of 1.00 m. At the top of the circular loop, the speed of the bucket is 4.00 m/s. Determine the acceleration, the net force and the individual force values when the bucket is at the top of the circular loop. Convert the following to scientific notation. Distance from Sun. : 92,960,000 . miles ____. Estimated Age of universe – 14,000,000,000. Convert the following to standard form. Speed of light = 9.0 * 10. An Invisible Force. Gravity. Every object pulls on every other object with an invisible force called . gravity. .. There is . gravity. between you and your toy car, but you won’t notice it because it is so weak.. In the mid-1500s, scientists begin to question accepted beliefs and make new theories based on experimentation. The Roots of Modern Science. The Medieval View. Most knowledge in the Middle Ages comes from the Bible and Greek/Roman sources.. Mark Sonnick. Newton’s Law of Gravitation . Neil DeGrasse Tyson. Chronology. b. . 1642, . Woolsthorpe. , Lincolnshire. 1661: Matriculates at Trinity College, Cambridge. 1665: Newton earns his B.A.; Plague. Ms. Ha. I. Astronomers. A. Galileo . Galilei. 1. Born in Italy: 1564. 2. Taught math at University. 3. New lens maker: telescope. 4. Galileo: 1609 built his own. B. What did he discover?. 1. Moon was rough, not smooth.