ORIGIN OF THE SOLAR SYSTEM How When?, and then What?

ORIGIN OF THE SOLAR SYSTEM How When?, and then What?

WHAT DO YOU THINK? When did the Solar system form? How did the solar system form? Is there evidence/ proof to back you up? How do we know what we know? What other puzzling questions do you have about the solar system?

FORMATION OF THE SOLAR SYSTEM During the videos record statistics under the what, how and when headings Stephen Hawkings video The formation of the solar system Proto planetary disc review formation http://www.youtube.com/watch? v 5l5mB-rFuGo

KEY WORDS AND CONCEPTS What are the key vocabulary words covered in the videos? What are the concepts we can use to connect to cause and effect actions in the formation of the solar system?

OUTLINE THE PROCESS Keep thinking about what came first? Be able to list the process in a sequence. How does this information tie in with our conversation about life cycle of stars? The origin of the solar system explains a number of things that we now take for granted – for example: planets orbit the sun. Name 3 other processes that resulted from the formation process.

GRAVITY – HOW DOES THAT TIE IN? Define Gravity – Who first “proved gravity”? With what experiment? Let’s see - gravity demo Who else do we relate to experiments with gravity? Take out your purple packet and read his bio. Newton’s laws of gravity: (1st)Law of inertia – an object at rest remains at rest until acted upon Same is true for an object in motion, until otherwise acted on. Does this relate to the solar system?

MORE NEWTONIAN PHYSICS Newton’s Law of Acceleration – Acceleration occurs when a force acts on a mass. (the bigger the mass the bigger the force) F M x A How is this related to the solar system? Newtons 3rd law – For every action there is an equal and opposite re-action. Hmmm- let’s consider this Gravity in common lingo

SO WHAT IS GRAVITY? Gravity is something we talk about all the time, and experience all the time. As living beings we are very used to the gravity we experience on Earth. Please consider how it might be different if we were on other planets or bodies in the solar system. Life on a planet with more gravity? Life on a planet with less gravity? How is gravity related to mass? To weight?

THE FORMULA – YIKES! F G x (M1 x M2) R 2 What?!!!!!!! We don’t have to multiply it out, we just have to understand how it works. F is the force due to gravity (how strong it is as a result of the other factors) G is just a constant, a number that you include every time on Earth Force due to gravity 9.81 m/s2. So which variables are we really working with when we compare gravity of objects on other planets?

LET’S TALK ABOUT GRAVITY’S VARIABLES given: F G x (M1 x M2) R 2 What do M1 and M2 represent in the solar system? M1 will always be the largest objects mass ( ie: the sun, or the earth) M2 will always be the smaller object’s mass (ie: you) (for this class) What would the radius be? Predict gravity for 2 different planets based on what you know. Defend your answer based on the formula.

LET’S USE SOME PLANET INFO NOW: If we use Earth’s gravity factor as 1 What would the gravity be on Mercury? Defend your answer What would the gravity be on Jupiter? Defend your answer Calculate your mass if your weight is force due to gravity. So F G M2 Ok, now lets calculate your mass on Mercury. Mercury’s gravity is 0.38 that of Earth’s gravity. And your mass on Jupiter? (2.36 that of Earth’s)

PLANET ORBITS

A FEW VIDEOS Harvard season interviews Ellipses

IT IS POSSIBLE FOR NEPTUNE TO BE FARTHEST FROM THE SUN?