Laws of Motion Newton and Kepler Isaac Newton

Laws of Motion Newton and Kepler

Isaac Newton English physicist l Developed the Laws of Motion l 1 st Law of Motion l l An object in motion stays in motion unless acted upon by an outside force. An object at rest stays at rest unless acted upon by an outside force.

l 2 nd Law of Motion l The acceleration of an object is in the same direction as the net force on the object l F = ma l 3 rd Law of Motion l For every action there is an equal and opposite reaction

Johannes Kepler l Kepler developed the Laws of Planetary Motion 1. 2. 3. The orbit of every planet is an ellipse. A line joining a planet and the sun sweeps out equal areas during equal intervals of time as the planet travels along its orbit. Longer orbits have longer periods, and the speed of a planet in a larger orbit is lower than in a smaller orbit.

Formation of the Universe l It is believed that the Universe started 13. 7 billion years ago as a massive explosion l The entire Universe was confined to a dense, hot, supermassive ball But how do we know this? l All galaxies appear to be moving away from the Earth l Data indicates the universe is still expanding l Cosmic background radiation l

Formation of a Galaxy l l Astronomers have come up with multiple theories as to the formation of galaxies One theory suggests that after the Big Bang millions of gas clouds (nebulae) and star clusters merged together

We are here

Center of Galaxy l Milky Way galaxy is 100, 000 light years across and 3, 000 light years thick l Light travels 10, 000, 000 kilometers in one year l