1. Gravitation Jeopardy Universal Law of Gravitation HistoryConceptualCircular Motion 10 20 30 40 50 60

2. Part 1: Universal Law of Gravitation

3. 10 Points – ULG State Newton’s Law of Universal Gravitation. AnswerMain

4. 10 Points Answer – ULG Any two objects that have mass will be gravitationally attracted to each other MainQuestion

5. 20 Points - ULG State the mathematical equation for Newton’s Universal Law of Gravitation. MainAnswer

6. 20 Points Answer – ULG F grav = Gm 1 m 2 /r 2 Gravitational force = Gravitational constant*mass1*mass2/radius 2 MainQuestion

7. 30 Points - ULG MainAnswer 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

8. 30 Points Answer – ULG F = Gm 1 m 2 /r 2 = (6.67x10 -11 )(200kg)(0.3kg)/(5m 2 ) = 1.6 x 10 -10 N MainQuestion

9. 40 Points – ULG MainAnswer Sketch a graph of the gravitational force versus the distance between two objects (radius) And how are they related? – Proportional or Inversely Related

10. 40 Points Answer – ULG MainQuestion How are these two physical quantities related? -Inversely proportional to the square of the distance

11. 50 Points – ULG MainAnswer How large does a planet have to be to attract you if you (70kg) were floating out in space approximately 250 m away? Assume it has to exert at least 10 N of gravitational force on you to pull you in.

12. 50 Points Answer – ULG 1.33 x 10 14 kg MainQuestion

13. 60 Points – ULG MainAnswer Two planets are floating around in space, both 2 x 10 23 kg. How far apart do they have to be to exert 100 N of force on each other?

14. 60 Points Answer – ULG 1.63 x 10 17 m apart MainQuestion

15. Part 2: History Main

16. 10 Points – History MainAnswer What does heliocentric mean?

17. 10 Points Answer – History Heliocentric: “Sun – centered” with reference to a heliocentric solar system where the planets orbit the sun. MainQuestion

18. 20 Points – History Who was the credited with the idea of a geocentric solar system? MainAnswer

19. 20 Points Answer – History Ptolemy MainQuestion

20. 30 Points – History How were Copernicus and Galileo’s support of a heliocentric solar system different? MainAnswer

21. 30 Points Answer – History Copernicus came up with the idea of a heliocentric solar system but did not support it. Galileo was imprisoned for his support of the heliocentric model MainQuestion

22. 40 Points – History DOUBLE JEOPARDY!!! Name three major facts about Tycho Brahe. MainAnswer

23. 40 Points Answer – History He had a midget He had an elk that got drunk at parties He had a gold nose He was the king’s astronomer HE TOOK THE MOST ACCURATE MEASUREMENTS OF the solar system at that time MainQuestion

24. 50 Points – History According to Newton, why would planets travel faster the closer they are to the sun? MainAnswer

25. 50 Points Answer – History MainQuestion Newton explained Kepler’s laws by stating that the gravitational pull was responsible. If the planet is closer, it will have a stronger gravitational attraction and travel faster.

26. 60 Points – History Which scientist sounds like something you would order at a restaurant? What was his greatest contribution? MainAnswer

27. 60 Points Answer – History MainQuestion Cavendish Developed an experiment that validated the universal law of gravitation between objects on a human scale.

28. Part 3: Conceptual Main

29. 10 Points – Conceptual Is the force of gravitation attractive or repulsive? MainAnswer

30. 10 Points Answer – Conceptual Attractive MainQuestion

31. 20 Points – Conceptual 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? MainAnswer

32. 20 Points Answer – Conceptual MainQuestion The force increases by 5.

33. 30 Points – Conceptual MainAnswer Using Newton’s Universal Law of Gravitation, if the radius between the objects increases by 5, what happens to the force exerted between them?

34. 30 Points Answer – Conceptual The force decreases by 5 2 Or the force is 1/25 of the original force. MainQuestion

35. 40 Points – Conceptual MainAnswer 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?

36. 40 Points Answer – Conceptual The forces are equal (Newton’s Third Law) and opposite in direction. MainQuestion

37. 50 Points – Conceptual Using Newton’s Universal Law of Gravitation, if the radius between the objects decreases by 5, what happens to the force exerted between them? AnswerMain

38. 50 Points Answer – Conceptual The force increases by 5 2 Or the force is 25 times the original force. QuestionMain

39. 60 Points – Conceptual Explain why planets orbit. Sketch the force and velocity arrows at each point in this diagram. AnswerMain

40. 60 Points Answer – Conceptual QuestionMain Planets orbit because the sun provides a centripetal force causing the planet to accelerate around it Velocity arrows are red – always tangent to the ellipse Force arrows are green – always pointed toward the sun

41. Part 1: Circular Motion

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

43. 10 Points Answer – CM Towards the center of the circle MainQuestion

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? MainAnswer

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. MainQuestion

46. 30 Points - CM MainAnswer 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.

47. 30 Points Answer – CM TOK: -m = 900kg -v = 10 m/s -r = 25.0 m a = v 2 /r = 10 2 /25 = 4 m/s 2 F = ma = 900*4 = 3600 N MainQuestion

48. 40 Points – CM MainAnswer 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.

49. 40 Points Answer – ULG MainQuestion Will leave the tube in the direction it was moving already (inertia)

50. 50 Points – CM MainAnswer 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

51. 50 Points Answer – 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 MainQuestion

52. 60 Points – CM MainAnswer Determine the centripetal force exerted upon a 40-kg child who makes 10 revolutions around the Cliffhanger in 29.3 seconds. The radius of the barrel is 2.90 meters.

53. 60 Points Answer – CM T = sec/rev = 29.3s/10rev = 2.93s v = 2πr/T = 2π(2.90m)/2.93s = 6.2m/s F = mv 2 /r = (40kg)(6.2 2 m/s)/(2.90m) = 533.4 N MainQuestion

54. Physics CP Jeopardy Gravitation and Circular Motion Review Main