Unit 3 Orbital Motion Big Idea 2 Newtons

Unit 3: Orbital Motion Big Idea #2: Newton’s Law of Gravity

Review our target… Using numbers (or graphs) explain how things in our solar system move

Today’s Success Criteria

What is GRAVITY? Gravity is a force of attraction that exists between ANY two objects Examples There is gravity between a pencil and the floor There is gravity between the Sun and Earth There is gravity between the Earth and Sun SO MUCH GRAVITY!!!

How does gravity work? ? Scale (Distance) Proportion (size) Quantity (mass)

Gravitational Force and Proportion (size) When there are 2 objects, the bigger object with exert more gravitational pull When there are 2 objects, the smaller object with exert less gravitational pull

Gravitational Force and Scale (distance) When 2 objects are closer, there is a greater gravitational force When 2 objects are far apart, there is la smaller gravitational force

Gravitational Force and Quantity (mass) When there are 2 objects, the object that has the larger mass will have the greater gravitational pull When there are 2 objects, the object that has the smaller mass will have the less gravitational pull

Today’s Success Criteria: q. SC 5: Predict how acceleration of planets varies with the distance according to Newton’s Law of Gravity. Why does it matter? Gravitational relationships help form Newton’s Law of Gravity

Big Question: What is Newton’s Law of Gravity and why do we care? http: //www. history. co m/shows/theuniverse/videos/beyo nd-the-big-bang-sirisaac-newtons-law-ofgravity