Gravitation Jeopardy

1. Gravitation Jeopardy

2. Part 1: Universal Law of Gravitation

3. 10 Points – ULG Using Newton’s Universal Law of Gravitation, if the mass of one of the objects increases by 5, what happens to the force exerted between them? Answer Main

4. 10 Points Answer – ULG • The force increases by 5. Question Main

5. 20 Points - ULG Using Newton’s Universal Law of Gravitation, if the radius between the objects increases by 5, what happens to the force exerted between them? Answer Main

6. 20 Points Answer – ULG • The force decreases by 52 Or the force is 1/25 of the original force. Question Main

7. 30 Points - ULG Using Newton’s Universal Law of Gravitation, if the radius between the objects decreasesby 5, what happens to the force exerted between them? Answer Main

8. 30 Points Answer – ULG • The force increases by 52 Or the force is 25 times the original force. Question Main

9. 40 Points – ULG • Determine the gravitational force exerted by cookie monster on a nearby cookie. • Mass of cookie monster: 200 kg • Mass of cookie: 0.3 kg • Distance between them: 5 m • G: 6.67 x 10-11 Answer Main

10. 40 Points Answer – ULG F = Gm1m2/r2 = (6.67x10-11)(200kg)(0.3kg)/(5m2) = 1.6 x 10-10 N Question Main

11. 50 Points – ULG • Graph gravitational force versus the distance between two objects • How are these two physical quantities related? • Directly proportional • Directly proportional to the square of the distance • Inversely proportional • Inversely proportional to the square of the distance Answer Main

12. 50 Points Answer – ULG • How are these two physical quantities related? • Directly proportional • Directly proportional to the square of the distance • Inversely proportional • Inversely proportional to the square of the distance Question Main

13. 60 Points – ULG • State Newton’s Law of Universal Gravitation. Answer Main

14. 60 Points Answer – ULG Fgrav = Gm1m2/r2 Gravitational force = Gravitational constant*mass1*mass2/radius2 Question Main

15. Part 2: Kepler’s Laws Main

16. 10 Points – Kepler • What is Kepler’s First Law? • What is at one focus? Answer Main

17. 10 Points Answer – Kepler Kepler’s First Law: All planets orbit around the sun in an elliptical shape. The sun is at one focus. Question Main

18. 20 Points – Kepler • What is Kepler’s Second Law? What does it tell you about the speed of an object in an elliptical orbit? Answer Main

19. 20 Points Answer – Kepler • Objects sweep out equal areas in equal amounts of time in their orbit T1 = T2 if A1 = A2 • Objects travel faster when closer to the sun Question Main

20. 30 Points – Kepler • State Kepler’s Third Law. What ratio is equal to Kepler’s constant for all bodies orbiting the sun? Answer Main

21. 30 Points Answer – Kepler • The period squared divided by the semi-major axis cubed is equal to Kepler’s constant. • Kepler’s constant is equal to 1. Question Main

22. 40 Points – KeplerDOUBLE JEOPARDY!!! • What does stellar retrograde motion depict? • Why does Kepler’s First Law explain this phenomena? Answer Main

23. 40 Points Answer – Kepler • Stellar retrograde motion is when stars or planets appear to move backwards in the sky. • We orbit the sun instead of all planets orbiting us; therefore, if we pass another planet as we circle the sun – it appears as though that planet is travelling backwards. Question Main

24. 50 Points – Kepler Earth moves more slowly in its orbit during June than during January. Is Earth closer to the sun in June or in January? What is the rationale for your answer? Answer Main

25. 50 Points Answer – Kepler • Earth is closer to the sun in January. Since it travels slower in June, that means the gravitational pull is less which means Earth must be farther away in June. Question Main

26. 60 Points – Kepler • Sketch the force and velocity arrows at each point in this diagram. Answer Main

27. 60 Points Answer – Kepler Velocity arrows are red – always tangent to the ellipse Force arrows are green – always pointed toward the focus Question Main

28. Part 3: Astronomy Main

29. 10 Points – Astronomy • What are the two types of planets and what are their main differences? Answer Main

30. 10 Points Answer – Astronomy • Terrestrial and Jovian • Terrestrial are rocky planets • Jovian are the gas giants Question Main

31. 20 Points – Astronomy • What are the criteria for being a planet? Answer Main

32. 20 Points Answer – Astronomy • Need to clear out the space in their orbit • Need to be circular in shape • Need to orbit the sun Question Main

33. 30 Points – Astronomy • How does the gravitational force exerted by one planet in space on a second relate to the force exerted by the second planet on the first? Answer Main

34. 30 Points Answer – Astronomy • The forces are equal (Newton’s Third Law) and opposite in direction. Question Main

35. 40 Points – Astronomy • List the planets around our sun in order. Answer Main

36. 40 Points Answer – Astronomy • Mercury, Venus, Earth, Mars • Jupiter, Saturn, Uranus, Neptune Question Main

37. 50 Points – Astronomy • Explain what causes tides. Answer Main

38. 50 Points Answer – Astronomy • The moon pulls on each side of the Earth differently, causing high tides on the side closest to the moon and further away. Question Main

39. 60 Points – Astronomy • What are comets? What shape do their orbits make? How does that help explain why comets may not have originally been part of the solar system? Answer Main

40. 60 Points Answer – Astronomy • Comets are balls of dust and ice. • They orbit in very eccentric orbits (very oval shapes) so they are not seen for very long periods of time • Because comets appear so irregularly, astronomers were not able to chart their course as easily as the other planets. Question Main

41. Part 1: Circular Motion

42. 10 Points – CM What direction is the acceleration for an object spinning in a circle? Answer Main

43. 10 Points Answer – CM • Towards the center of the circle Question Main

44. 20 Points - CM Anna Litical is practicing a centripetal force demonstration at home. She fills a bucket with water, ties it to a strong rope, and spins it in a circle. Why does the water not fall out? Answer Main

45. 20 Points Answer – CM • Inertia keeps the water moving in a straight line, so the water “pushes against the back of the bucket” keeping it from falling out. Question Main

46. 30 Points - CM A 900-kg car moving at 10 m/s takes a turn around a circle with a radius of 25.0 m. Determine the acceleration and the net force acting upon the car. Answer Main

47. 30 Points Answer – CM TOK: • m = 900kg • v = 10 m/s • r = 25.0 m a = v2/r = 102/25 = 4 m/s2 F = ma = 900*4 = 3600 N Question Main

48. 40 Points – CM A tube is been placed upon the table and shaped into a three-quarters circle. A golf ball is pushed into the tube at one end at high speed. The ball rolls through the tube and exits at the opposite end. Describe the path of the golf ball as it exits the tube. Answer Main

49. 40 Points Answer – CM Will leave the tube in the direction it was moving already (inertia) Question Main

50. 50 Points – CM • You want to make a bowling ball travel in a circular counter-clockwise path around you (this means YOU are the center point). After you set the ball in motion “to the left”, in what direction will force need to be exerted to keep the ball in a circular path? • You need to constantly push the ball away from you • You need to constantly push the ball toward you. • You need to constantly push the ball to the left Answer Main