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March 8 th 2012

March 8 th 2012. ESSENTIAL QUESTION :. 1,3-6 What is the effect of gravity on Earth and objects in space? 2 nd : Describe the affect of Newton’s three laws on orbiting objects. LEARNING OBJECTIVE:. 1,3-6: Assessment 2 nd : What are Newton’s Three Laws of Motion.

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March 8 th 2012

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  1. March 8th 2012 ESSENTIAL QUESTION: 1,3-6 What is the effect of gravity on Earth and objects in space? 2nd: Describe the affect of Newton’s three laws on orbiting objects LEARNING OBJECTIVE: 1,3-6: Assessment 2nd: What are Newton’s Three Laws of Motion WARM UP: 1,3-6 Draw a wave and label the following parts- crest, trough, amplitude, wave length. 2nd: See Next Slide AGENDA • Warm up • Per 1,3-6: Test Part 2 • Per 2nd: • Kepler Quiz go over • Task analysis on Gravity • Discussion - Newton and Gravity

  2. WARM UP FOR PERIOD 2: A spacecraft orbits an asteroid at a distance of 10,000 km. A satellite, 1/20 the mass of the spacecraft, departs and starts to orbit the asteroid at a distance of 5000 km. Compare the gravity on the satellite now verses when it docked to the spacecraft?

  3. March 8th , 2012 FORMATIVE ASSESSMENT: . Teacher led Questions on student’s understanding of today’s lesson. VOCABULARY: gravity, Earth’s acceleration due to gravity, mass, neap tide, spring tide, gravitational tides , inertial tides . PRACTICE: ASSIGNMENTS: NOTES:

  4. March 7th 2012 ESSENTIAL QUESTION: 1,3-6 What is the effect of gravity on Earth and objects in space? 2nd: Describe the affect of Newton’s three laws on orbiting objects LEARNING OBJECTIVE: 1,3-6: Assessment 2nd: What are Newton’s Three Laws of Motion WARM UP: 1,3-6 No Warm Up 2nd: You have two 10 kg lead spheres that are 5 meters apart. What is the factor of gravity when you quadruple the mass of one sphere and triple the distance ? AGENDA • Warm up • Per 1,3-6: Test Part 1 • Per 2nd: • Kepler Quiz go over • Task analysis on Gravity • Discussion - Newton and Gravity

  5. March 7th , 2012 FORMATIVE ASSESSMENT: . Teacher led Questions on student’s understanding of today’s lesson. VOCABULARY: gravity, Earth’s acceleration due to gravity, mass, neap tide, spring tide, gravitational tides , inertial tides . PRACTICE: ASSIGNMENTS: NOTES:

  6. March 6th 2012 ESSENTIAL QUESTION: What causes tides? Describe the affect of Newton’s three laws on orbiting objects LEARNING OBJECTIVE: What are Newton’s Three Laws of Motion Compare and contrast neap tides and spring tides WARM UP: If two objects of unequal mass orbit each other, where would you find the center of gravity? AGENDA • Warm up • Per 1,3-6: • Review and Go over Quiz on Kepler • Per 2nd: • Task analysis on Gravity • Discussion - Newton and Gravity

  7. March 6th , 2012 FORMATIVE ASSESSMENT: . Teacher led Questions on student’s understanding of today’s lesson. VOCABULARY: gravity, Earth’s acceleration due to gravity, mass, neap tide, spring tide, gravitational tides , inertial tides . PRACTICE: ASSIGNMENTS: NOTES:

  8. I SCREWED UP yesterday’s warmup! So here is the correction (Kudos to Mark Mccolloh for pointing this out) . PLEASE CORRECT THIS ON YESTERDAY’S WARM UP! When a rock is thrown up, at the apogee it’s net velocity is zero but its net force is the weight of the rock. Gravity is always interacting with the rock so the force on it is constant.

  9. March 5th 2012 ESSENTIAL QUESTION: What causes tides? Describe the affect of Newton’s three laws on orbiting objects LEARNING OBJECTIVE: What are Newton’s Three Laws of Motion Compare and contrast neap tides and spring tides WARM UP: Per 1,3-6: What are the net forces on a rock at apogee, when it is thrown vertically into the air? Per. 2: What is the difference between mass and weight? AGENDA • Warm up • Per 1,3-6: • Copy the back nine of the study guide • Make sure you have copied down the Chart of gravitational interaction. • Newton’s 3 Laws recap • Tides and Einstein • Per 2nd: Discussion - Newton and Gravity

  10. March 5th , 2012 FORMATIVE ASSESSMENT: . Teacher led Questions on student’s understanding of today’s lesson. VOCABULARY: gravity, Earth’s acceleration due to gravity, mass, neap tide, spring tide, gravitational tides , inertial tides . PRACTICE: ASSIGNMENTS: NOTES:

  11. First a general definition of mass: it is the number of particles in an object. Since a force affects an entire object , we must assume that every particle of that object has to be affected. Second, remember that in the First law we discussed an unbalanced force (the “outside” force). For there to be an outside force you need to speed an object up, slow it down or change its direction.

  12. So Newton’s Second Law tells that a force affects every particle of an object – every particle’s speed and/or direction is being affected. Mathematically if I want to know how much a crate of apples (forgive the Newtonian pun) costs, I need to know how many apples (particles) and how much each apple costs (acceleration) : Cost of the crate of apples (Force) is equal to the # of apples times the cost of each. F = (mass) (acceleration) Tomorrow’s episode: Newtons exciting Third Law

  13. Newton’s exciting Third Law – If two objects (particles, elephants, ants or planets, galaxies) touch (pairs) they both feel the touch (equal). The nerves go back to their own brains means the touch goes BACK to them (opposite). Generally if you can’t feel the force, then there is no force! SIDE NOTE: There are only a few forces ( such as gravity and magnetism) that do not have to touch – these are called non-contact forces – forces over a distance) SO all forces come in pairs that arre opposite and equal.

  14. View down on to the North Pole

  15. Gravitational Effects – Mass & Distance

  16. Period 1,3-6 A spaceship is orbiting a small asteroid at 1,000 km. The spaceship has a mass that is 1/10 that of asteroid. Another spaceship, with identical mass docks with the first spaceship. The two ships, while docked, back off to 3000 km from the asteroid. How much has the gravitational effect changed between the ships and the asteroid? Do you think that the two spaceships have an effect on the asteroid? Period 2 Draw an ellipse, label aphelion & perihelion. Indicate kinetic energy & potential energy at its greatest. Indicate where it becomes more than half KE.

  17. WARM UP: 1,3-6: You have two 10 kg lead spheres that are 5 meters apart. What is the factor of gravity when you quadruple the mass of one sphere and triple the distance ? What were Galileo’s contributions to astronomy? How many accelerators does your car have? What are they? What was Galileo’s problem with Aristotelian view of the world?

  18. Draw an ellipse, label aphelion & perihelion. Indicate kinetic energy & potential energy at its greatest. Indicate where it becomes more than half KE. There is three planet solar system (planet Beta, Delta and Gamma, planets orbiting a 2 solar mass star. Planet Gamma is 6 AU, Planet Delta is 3 AU and the last planet’s distance (Beta) is unknown but its orbital period is 0.5 Earth years long. What is planet G and D’s period, what is Planet B’s distance for its parent star? If the sun tripled its mass how would it change the periods and/or distances. BTW why is there no Alpha Planet?

  19. Perihelion Inferior Conjunction Aphelion Opposition Conjunction EARTH Superior Conjunction

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