LMS 07 Activity 2 Laws of Physics

Storyboard Text

• Hello Everyone, I am Dianne Nazario﻿﻿﻿﻿
• ﻿﻿﻿We'll be studying about "Kepler's law of planetary motion" today.﻿﻿﻿
• ﻿﻿Kepler's law of motion, written between 1609 and 1619 by Johannes Kepler, describes the orbits of planets around the Sun in astronomy. The rules changed Nicolaus Copernicus' heliocentric theory, describing how planetary velocities fluctuate by substituting circular orbits and epicycles with elliptical trajectories.﻿﻿﻿
• ﻿﻿﻿﻿﻿1. The planet's orbit is elliptical, with the Sun at one of the two foci.﻿﻿
• ﻿2. A segmented line between a planet and the Sun sweeps out equal portions at equal time intervals.﻿﻿
• ﻿﻿﻿3. The cube of the length of the semi-major axis of a planet's orbit is equal to the square of its orbital period.﻿﻿
• ﻿﻿Asa result of his own laws of motion and universal gravitation, Isaac Newton demonstrated in 1687 that relationships like Kepler's would apply to the Solar System to a good approximation.﻿
• ﻿﻿﻿The laws of Johannes Kepler enhanced Copernicus' model. If the eccentricities of planetary orbits are assumed to be zero, Kepler agrees with Copernicus:﻿﻿
• ﻿﻿﻿1.The planetary orbit is circle 2.The Sun is at the center of the orbit.3.The speed of the planet in the orbit is constant.﻿﻿
• ﻿﻿﻿﻿ 3. The linear and angular speeds of the planet in orbit are both constant, but the area speed (which is traditionally tied to the idea of angular momentum) is.﻿﻿
• ﻿﻿﻿﻿2. The Sun is not at the center of the elliptical orbit, but rather at one of its focal points.﻿
• ﻿﻿Because the eccentricities of the orbits of the planets known to Copernicus and Kepler are tiny, the preceding principles provide reasonable estimates of planetary motion, but Kepler's law fits the data better than Copernicus' model. The following are Kepler's corrections:﻿
• ﻿﻿﻿﻿﻿1. The planetary orbit is an ellipse, not a circle.﻿﻿﻿
• ﻿﻿I hope you guys learned something new again today. Have a nice day Everyone, thanks for listening!!﻿