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Physical Science Bell Ringers Fall semester 2011-12 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 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. 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. 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 December 5, 2011 A machine that changes only the direction of a force has a mechanical advantage of ____. a. b. c. d. 1 5 100 10 December 2, 2011 Explain how machines make work easier. 1st & 4th = Turn in 7 bell ringers 5th = turn in 6 bell ringers (no BR yesterday) December 1, 2011 Calculate the power of an object that does 5500 J of work for 33 seconds. 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. November 29, 2011 What is work? November 28, 2011 Add to 2 bell ringers from last week Describe your favorite dish that you ate over Thanksgiving break. 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 November 21, 2011 Use the formula to compute the height of a rocket climbing 12 seconds: S = ½ at2 S = distance (height) traveled a = the gravitational constant = 32 feet per second squared = 32 ft/sec2 = 9.8 meters per second squared = 9.8 m/s2 t = time in seconds 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 November 17, 2011 Which ball in Figure 4-1 has the greatest potential energy? November 16, 2011 No Bell ringer, Mrs. Green absent November 15, 2011 A dump truck, a sports car, and a bicycle are traveling at the same velocity. Compare their kinetic energies. November 14, 2011 A 15-kg bicycle carrying a 45kg girl is traveling at a speed of 10 m/s. What is the kinetic energy of the girl and bicycle? Turn student release form into the tray. 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. November 10, 2011 Give an example of how energy can be transformed from one form to another. Turn student release form into the tray. November 9, 2011 What was your favorite part of the rocket project so far? Practice launch will be tomorrow!!!!!! November 7, 2011 What is the kinetic energy of a 3kilogram 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 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 How many babies did Dr. Jones deliver in 1998? A. 25 B. 35 C. 45 D. 55 E. 65 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 Turn student release form into the tray. November 3, 2011 Describe different forms of potential energy. Turn in 4 bell ringers from the week. (I won’t be here tomorrow) Make up test MUST be done TODAY after school Turn student release form into the tray. November 2, 2011 Define kinetic energy. Turn student release form into the tray. 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? October 31, 2011 Turn student release form into the tray. What makes a rocket fly through the air? Get out Ch. 4 Notes – 7 sections October 28, 2011 Turn student release form into the tray. A 10-kg wagon has a speed of 25 m/s. What is its momentum? Turn in 5 bell ringers from this week October 27, 2011 Two Turn student release form into the tray. 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. October 26, 2011 According to Newton's second law of motion, a larger force acting on an object causes a greater ________ of the object October 25, 2011 Which of the following would have the most momentum and therefore cause a softball to move the most? A. B. C. D. Racquetball Ping Pong Ball Tennis Ball Baseball Softball = 180 g Baseball = 145 g Racquetball = 42 g Tennis ball = 57g 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 October 21, 2011 State Turn Newton’s 3rd law. in 4 bell ringers from this week October 20, 2011 What is momentum? Turn in unused homework extension passes for 5pts bonus October 19, 2011 No bell ringer, Mrs. Green absent 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 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 October 17, 2011 Explain the difference between mass and weight. October 14, 2011 What do you think Newton’s 3rd law is now that you know the first 2? Turn in 5 bell ringers from this week October 13, 2011 Calculate the net force. Determine the acceleration of the 5 kg object at the above force. October 12, 2011 State Newton’s 1st and 2nd Laws. October 11, 2011 How are inertia and mass related, according to Newton’s 1st law? October 10, 2011 Tell me three things you did over Fall Break. Tell me more than slept and watched T.V. Tuesday, Thursday Period 1 2 3 4 5 6 7 FLEX Start 8:25 9:15 10:02 10:49 12:08 12:55 1:42 2:29 Stop 9:10 9:57 10:44 12:03 12:50 1:37 2:24 3:00 September 29 & 30, 2011 No bell ringers as Mrs. Green was at a conference 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 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? September 26, 2011 Find the acceleration of a car that goes from 32 m/s to 96 m/s in 8.0 s. September 23, 2011 Explain what happens if 2 objects have the same speed but different velocities. Turn in 4 bell ringers from this week September 22, 2011 Explain how forces and motion are related. September 21, 2011 No Bell Ringer, Mrs. Green at a conference 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. September 19, 2011 Starting from rest, if a car accelerates at 0.90 m/s2, how fast would be moving after 6.0 seconds? Dv a t 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 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? 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? September 13, 2011 What is the equation to calculate acceleration? September 12, 2011 If a car travels 100 meters in 3.2 seconds, what is the average speed? September 9, 2011 1st – What is the difference between average speed and average velocity? 4th & 5th – 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 September 8, 2011 1st = What is the distance and the displacement of the race car drivers in the Indy 500? 4th & 5th = What is the difference between average speed and average velocity? 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? September 6, 2011 What is motion? September 2, 2011 No bell ringer, projector broken Turn in 4 bell ringers from this week September 1, 2011 Draw a bar graph to illustrate the following information about soccer team wins: Year 2005 2006 2007 2008 2009 WINS 2 8 4 7 9 August 31, 2011 On the graph, what percentage of fuel usage is electric and steam? 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. August 29, 2011 Arrange each of the following in order from largest to smallest. centimeter kilometers meters micrometers millimeters August 26, 2011 Convert 1750 ml to liters. Convert 2 ½ liters to cc's (Cubic centimeters) Turn in bell ringers from this week 1st & 4th = 4 5th = 3 Page 879 #1-4, 6-10 Math Problems August 25, 2011 Complete the following conversions: 38 cm into meters 459 mL into centiliters 1123 kg in grams Kelvin = °C +273 °C = Kelvin - 273 cm3 = mL August 24, 2011 Convert the following numbers into scientific notation: 348594 0.024094 0.000004595 1025 August 23, 2011 No bell ringer, Mrs. Green absent August 22, 2011 How many babies did Dr. Jones deliver in 1998? A. 25 B. 35 C. 45 D. 55 E. 65 August 19, 2011 Define precision and accuracy. Turn in 5 bell ringers from this week 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. 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. 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. 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?