1. Physical Science Bell Ringers Fall semester 2011-12

2. December 9, 2011  Machines make work easier in two ways, one way is by changing the direction of the applied force, what is the other way?  Turn in 5 bell ringers from this week

3. December 8, 2011  Sally and Pete do the same amount of work. Sally does the work in 2.3 hours and Pete does it in 2.5 hours. Who is more powerful? Explain.

4. December 7, 2011  How much power will it take to move a 10 kg mass at an acceleration of 2 m/s/s a distance of 10 meters in 5 seconds? This problem requires you to use the formulas for force, work, and power all in that order.

5. December 6, 2011  The fixed pulley shown in the Figure does which one of the following?  a.decreases the force required and changes the direction of the force required  b.doubles the force required to lift the block  c.decrease the force required to lift the block  d.makes the block easier to lift by changing the direction of the force needed to lift it

6. December 5, 2011  A machine that changes only the direction of a force has a mechanical advantage of ____.  a.1  b.5  c.100  d.10

7. December 2, 2011  Explain how machines make work easier.  1 st & 4 th = Turn in 7 bell ringers  5 th = turn in 6 bell ringers (no BR yesterday)

8. December 1, 2011  Calculate the power of an object that does 5500 J of work for 33 seconds.

9. November 30, 2011  Calculate work and power if you have a 3500 N force acting on an object to move it 5 meters in 40 seconds.

10. November 29, 2011  What is work?

11. November 28, 2011  Add to 2 bell ringers from last week  Describe your favorite dish that you ate over Thanksgiving break.

12. November 22, 2011  What country launched the world's first man-made satellite, Sputnik, into Earth orbit on October 4, 1957?  Save bell ringers in your folder, we will turn them in next week with those bell ringers

13. November 21, 2011  Use the formula to compute the height of a rocket climbing 12 seconds:  S = ½ at 2 S = distance (height) traveled a = the gravitational constant = 32 feet per second squared = 32 ft / sec 2 = 9.8 meters per second squared = 9.8 m / s 2 t = time in seconds

14. November 18, 2011  When you move your hand or foot, your body has converted potential energy into ________ energy.  Turn in 4 bell ringers from this week

15. November 17, 2011  Which ball in Figure 4-1 has the greatest potential energy?

16. November 16, 2011  No Bell ringer, Mrs. Green absent

17. November 15, 2011  A dump truck, a sports car, and a bicycle are traveling at the same velocity. Compare their kinetic energies.

18. November 14, 2011  A 15-kg bicycle carrying a 45- kg girl is traveling at a speed of 10 m/s. What is the kinetic energy of the girl and bicycle?

19. November 11, 2011  Define the law of conservation of energy  Turn in 4 bell ringers from this week Turn student release form into the tray.

20. November 10, 2011  Give an example of how energy can be transformed from one form to another. Turn student release form into the tray.

21. November 9, 2011  What was your favorite part of the rocket project so far? Turn student release form into the tray. Practice launch will be tomorrow!!!!!!

22. November 7, 2011  What is the kinetic energy of a 3- kilogram ball that is rolling at 2 meters per second?  The potential energy of an apple is 6.00 joules. The apple is 3.00-meters high. What is the mass of the apple?  m = gh/GPE

23. What was the average number of babies that Dr. Jones delivered each year from 1995 to 1998? A. 35 B. 40 C. 45 D. 50 E. 55

24. How many babies did Dr. Jones deliver in 1998? A. 25 B. 35 C. 45 D. 55 E. 65

25. If Dr. Jones delivered 85 babies in 1999, how many rattles would represent this number? A. 6 ½ B. 7 C. 7 ½ D. 8 E. 8 ½

26. November 3, 2011  Describe different forms of potential energy.  Turn in 4 bell ringers from the week.  (I won’t be here tomorrow) Turn student release form into the tray. Make up test MUST be done TODAY after school

27. November 2, 2011  Define kinetic energy. Turn student release form into the tray.

28. November 1, 2011  Is the chemical energy stored in food the same as the energy that comes from the Sun or the energy stored in gasoline? Turn student release form into the tray.

29. October 31, 2011  What makes a rocket fly through the air? Turn student release form into the tray. Get out Ch. 4 Notes – 7 sections

30. October 28, 2011  A 10-kg wagon has a speed of 25 m/s. What is its momentum?  Turn in 5 bell ringers from this week Turn student release form into the tray.

31. October 27, 2011  Two objects that have the same mass are dropped from a tall building. One object is larger and flatter than the other. Explain why the larger, flatter object hits the ground last. Turn student release form into the tray.

32. October 26, 2011  According to Newton's second law of motion, a larger force acting on an object causes a greater ________ of the object

33. October 25, 2011  Which of the following would have the most momentum and therefore cause a softball to move the most? A. Racquetball B. Ping Pong Ball C. Tennis Ball D. Baseball

34.  Softball = 180 g  Baseball = 145 g  Racquetball = 42 g  Tennis ball = 57g

35. October 24, 2011 If 7,650 trucks were sold in 1999, how many total vehicles were sold in 1999? A. 35,000 B. 40,000 C. 45,000 D. 50,000 E. 55,000

36. October 21, 2011  State Newton’s 3 rd law.  Turn in 4 bell ringers from this week

37. October 20, 2011  What is momentum? Turn in unused homework extension passes for 5pts bonus

38. October 19, 2011  No bell ringer, Mrs. Green absent

39. October 18, 2011  Describe projectile motion.  Tomorrow is the last day of the 9 week grading period Turn in unused homework extension passes for 5pts bonus

40. October 18, 2011  Describe projectile motion.  Tomorrow is the last day of the 9 week grading period Agenda:  Turn in 4.1 WKT  Gravity Hands-on Activity (Get in groups of 2-3)  1.3 Graph WKT Turn in unused homework extension passes for 5pts bonus

41. October 17, 2011  Explain the difference between mass and weight.

42. October 14, 2011  What do you think Newton’s 3 rd law is now that you know the first 2?  Turn in 5 bell ringers from this week

43. October 13, 2011  Calculate the net force.  Determine the acceleration of the 5 kg object at the above force.

44. October 12, 2011  State Newton’s 1 st and 2 nd Laws.

45. October 11, 2011  How are inertia and mass related, according to Newton’s 1 st law?

46. October 10, 2011  Tell me three things you did over Fall Break. Tell me more than slept and watched T.V.

47. PeriodStartStop 18:259:10 29:159:57 310:0210:44 410:4912:03 512:0812:50 612:551:37 71:422:24 FLEX2:293:00 Tuesday, Thursday

48. September 29 & 30, 2011  No bell ringers as Mrs. Green was at a conference

49. September 28, 2011  Can a penny kill someone if dropped from the top of a skyscraper?  Turn in 3 bell ringers from this week as I will not be here Thursday & Friday

50. September 27, 2011  A truck travels to and from a stone quarry that is located 2.5 km to the east.  What is its distance?  What is its displacement?

51. September 26, 2011  Find the acceleration of a car that goes from 32 m/s to 96 m/s in 8.0 s.

52. September 23, 2011  Explain what happens if 2 objects have the same speed but different velocities.  Turn in 4 bell ringers from this week

53. September 22, 2011  Explain how forces and motion are related.

54. September 21, 2011  No Bell Ringer, Mrs. Green at a conference

55. September 20, 2011  Create a graph showing an object with positive velocity and positive acceleration.  Create another line on your graph to indicate an object with constant velocity.

56. September 19, 2011  Starting from rest, if a car accelerates at 0.90 m/s 2, how fast would be moving after 6.0 seconds? a vv t

57. September 16, 2011  In yesterday’s acceleration lab, when did your car have the fastest acceleration (when on the low or high incline)?  Turn in 5 bell ringers from this week

58. September 15, 2011  During a race, a sprinter increases from 5.0 m/s to 7.5 m/s over a period of 1.25s. What is the sprinter’s average acceleration?

59. September 14, 2011  A dragster in a race accelerated from stop to 40 m/ s by the time it reached the finish line. The dragster moved in a straight line and traveled from the starting line to the finish line in 10.0 sec.  What was the acceleration of the dragster?

60. September 13, 2011  What is the equation to calculate acceleration?

61. September 12, 2011  If a car travels 100 meters in 3.2 seconds, what is the average speed?

62. September 9, 2011  1 st – What is the difference between average speed and average velocity? 4 th & 5 th – The fastest trains are magnetically levitated above the rails to avoid friction. The fastest trains travel about 155 miles in a half an hour.  What is their average speed in miles/hour?  Turn in 4 bell ringers from this week

63. September 8, 2011  1 st = What is the distance and the displacement of the race car drivers in the Indy 500?  4 th & 5 th = What is the difference between average speed and average velocity?

64. September 7, 2011 Check Your Understanding from yesterday  What is the displacement of the cross-country team if they begin at the school, run 10 miles and finish back at the school?

65. September 6, 2011  What is motion?

66. September 2, 2011  No bell ringer, projector broken  Turn in 4 bell ringers from this week

67. September 1, 2011  Draw a bar graph to illustrate the following information about soccer team wins:  YearWINS  20052  20068  20074  20087  20099

68. August 31, 2011  On the graph, what percentage of fuel usage is electric and steam?

69. August 30, 2011  Use the graph in Figure 1-3 to find the number of grams of sugar that will dissolve in 100 grams of water at 80ºC.

70. August 29, 2011  Arrange each of the following in order from largest to smallest.  centimeter  kilometers  meters  micrometers  millimeters

71. August 26, 2011  Convert 1750 ml to liters.  Convert 2 ½ liters to cc's (Cubic centimeters)  Turn in bell ringers from this week  1 st & 4 th = 4  5 th = 3

72. August 25, 2011  Complete the following conversions:  38 cm into meters  459 mL into centiliters  1123 kg in grams Page 879 #1-4, 6-10 Math Problems Kelvin = °C +273 °C = Kelvin - 273 cm 3 = mL

73. August 24, 2011  Convert the following numbers into scientific notation:  348594  0.024094  0.000004595  1025

74. August 23, 2011  No bell ringer, Mrs. Green absent

75. August 22, 2011 How many babies did Dr. Jones deliver in 1998? A. 25 B. 35 C. 45 D. 55 E. 65

76. August 19, 2011  Define precision and accuracy.  Turn in 5 bell ringers from this week

77. August 18, 2011  Name the steps of the scientific method Add to yesterday’s bell ringer, just write the date and the answer. If you were absent yesterday, write yesterday’s date and “absent” then answer today’s bell ringer.

78. August 17, 2011  What does Physical Science cover? Add to yesterday’s bell ringer, just write the date and the answer. If you were absent yesterday, write yesterday’s date and “absent” then answer today’s bell ringer.

79. August 16, 2011  What are the three main branches of science? Add to yesterday’s bell ringer, just write the date and the answer. If you were absent yesterday, get out a piece of paper, put your name on it. Write yesterday’s date and “absent” then answer today’s bell ringer.

80. August 15, 2011  Get out a piece of paper, write today’s date and answer the question below  Hold on to your paper as we will turn them in on Friday once we have a week of bell ringers What is Physical Science?