Week 2- Power and Work Lab You need 5 people, including yourself. Everyone must be able to climb stairs. You need a staircase preferably with a railing to be safe. Measure one step in meters and then calculate the height of the staircase. (You can copy and paste this info in a new word doc or create your own data tables.) Height of staircase in meters: . This is your distance in part 2. 1. Calculate the weight force of each member of your group in Newtons. 2.2 pounds is one Kg, so divide pounds by 2.2. Then convert the Kg to Newtons. (This is in your book in chapter 4) The answer in Newtons is your weight force. Weight Force=m x g (Weight force is mass x gravity. In step 1 divide pounds by 2.2 then you need to multiply by gravity. g = 9.8 m/seconds squared to get Newtons but you can round gravity off to g = 10 m/seconds squared for easier math. Weight is gravitational attraction between one's body and the earth. If the mass of Earth somehow increased with no change in radius, your weight would increase also.) Example: If someone weighs 200 pounds, then first divide by 2.2 . 200/2.2 = 90.9 kg Then to get weight force you need to take Weight Force = m x g = 90.9 x 10 = 909 Newtons This is the value that goes in the Table in part 1 = Weight force (N)} Names Weight in pounds Weight force (N) 2. 3 1I1 1 1 5. Power and Work Lab Page 1 | 3Assignment Overview Due: Saturday 11:59 p.m. CST Directions: Use the provided guidelines to complete the power and work lab. Upload the lab as a file when you have completed the assignment. 1. Follow the directions specified in Lab 2 for collecting data for the exercise. . You need five people, including yourself. Everyone must be able to climb stairs. o You need a staircase, preferably with a railing to be safe. o Measure one step in meters and then calculate the height of the staircase. 2. After collecting, fill in the collected data in a data table. You can copy and paste this information in a new Word document or create your own data tables. 3. Next you will calculate the following with the help of the collected data: . Weight force of each member of your group in Newtons. Work ea didNames PE 2. 3. 5. 5. A. Two people of the same weight climb a flight of stairs. The first person climbs the stairs in 30s and the second person in 40s. Which person does the most work? Which person produces the most power? Can one say anything about the efficiency of one to the other? B. Which requires more work: lifting a 50-kg sack vertically 2 m or lifting a 25-kg sack vertically 4 m? C. A machine puts out 100 W of power for every 1000 W put into it. The efficiency of the machine is (note: A jack system will increase the potential energy of a heavy load by no more than 1000 J with a work input of 2000 J. The efficiency of the jack system is at most 50%) 6. What can you conclude? Provide a minimum of a five-sentence response discussing the horsepower of each person. In addition, what did you notice about the PE and the work of each person at the top of the stairs. Power and Work Lab Page 3 | 3-=ll ED 1 of1 Lab 2Power and Work Rubric 45H\" Grading Criteria 40-50 points . Complete and correct table information for #14 8. . Correct responses for #5-6 8. 0 Responses meet posted length requirements in #6 . Lab report by due date. 30.40 points . Complete and correct table information for #1-4 8. . Correct responses for #5-6 8. . Responses are generally clearly written for #5 & 6. . Table 2 8. 4 do not have the same numeric values. a Lab report one day late. 20-30 points 0 Table information not complete for #1 -4 & . Incorrect responses for #5 andfor #6. . Responses do not meet posted length requirements on #6. . Table 2 8. 4 do not have the same numeric values. . Lab report is two days late 10-20 points a Table information not complete for #1-4 & o Incorrect responses for #5 andlor #6 &/or . Responses do not meet posted length requirements on #6. . No response on #5 or #6 but table values present. . Lab report is three days late. 0-10 Points a Not all tables complete a No response on #5 or #6 but table values present. 0 Response is plagiarized (will result in 0 points automatically). . Responses are missing. . Lab report is four days late. . No lab report submitted within proper time period (automatic zero) ter co ecting, In t e co ecte ata In a data table. You can copy and paste this information in a new Word document or create your own data tables. 3. Next you will calculate the following with the help of the collected data: 0 Weight force of each member of your group in Newtons. Work each person did when he or she went up the stairs. Power produced by each person when he or she went up the stairs. Amount of potential energy each person had at the top of the stairs. 4. As last part of the activity, you will have to draw a conclusion to the above activity by answering the fol lowing questions: 0 Provide a minimum of a vesentence response discussing the horsepower of each person. In addition, what did you notice about the PE and the work of each person at the top of the stairs? How did you make sure you measured accurately and fairly? 5. Also, respond to three parts of question ve in the lab activity worksheet (Week 2 Power & Work Lab). I f! I". ll] II I If Vii] 2. How much work does each person do when they go up the stairs? Use Force times Distance. Hint you will be using weight force. W: Fd (Work = Weight Force x d) Names Work (J) 3. How much power does each person produce when going up the steps? You will need to time each person in seconds. P = Jlt (Your time needs to be in seconds.) {Power = Work (J)Itime(sec) and HP = Power x 1hp!746 Watts} Names Power (Jls) HP 5. 4. How much PE did each person have at the top of the stairs, assuming that they could fall all the way to the bottom? What unit will you use? Hint you already have done this. Don't make anyone fall down the stairs! PE= mgh (Remember: g= gravity or 9.8m!s2= 10 W52 } PE = Weight force x h Power and Work Lab Page 2 l 3