ࡱ> q` bjbjqPqP .::wtttt   T$$$8\$/88888KKK$qhټ8 K^KKK8tt88M(K:tl8 8K h, 8, $:: u<ª4w w w (KKK88ˡ"KKKKKKK///Ap*///p d@tttttt Work, Power, and Energy Objective: To explore the relationship between work and power. In Part 1 of this lab, students will learn how to differentiate between the two. In Part 2, students will calculate how much work is required to use up the energy in a food. Part 1 Materials: Meter stick, Stop watch, Stairs, Calculator Procedure: 1. Divide into groups of three students each. Fill in the data table as you do the calculations. Show your work throughout. 2. Find the vertical height in meters of the stairs that you will climb as part of this lab. You will be going up and down the stairs to determine the amount of force, work, and power you use in climbing the stairs. 3. Determine the mass in kilograms of each student in your group. 4. Determine the force (in Newtons) each student exerts on the floor. 5. Determine the work (in Joules) that each student will do as he or she climbs the stairs. 6. Time each student as he/she walks up the stairs. Repeat for a total of three walking trials per student. 7. Time each student as he/she runs up the stairs. Repeat for a total of three running trials per student. 8. Calculate the power output (in Watts) of each student. Formulas: 1 kg = 2.2 pounds Force (N) = mass (kg) x acceleration (m/s2) Acceleration due to gravity = 9.8m/s2 Work (J) = Force (N) x distance (m) Power (W) = Work (J)/time (s) Data and calculations: Student 1 Name: _______________________________________ WalkingDistance (m)Mass (kg)Force (N)Work (J)Time (s)Power (W)Trial 1Trial 2Trial 3Average RunningDistance (m)Mass (kg)Force (N)Work (J)Time (s)Power (W)Trial 1Trial 2Trial 3Average Student 2 Name: _________________________________________ WalkingDistance (m)Mass (kg)Force (N)Work (J)Time (s)Power (W)Trial 1Trial 2Trial 3Average RunningDistance (m)Mass (kg)Force (N)Work (J)Time (s)Power (W)Trial 1Trial 2Trial 3Average Student 3 Name: ____________________________________________ WalkingDistance (m)Mass (kg)Force (N)Work (J)Time (s)Power (W)Trial 1Trial 2Trial 3Average RunningDistance (m)Mass (kg)Force (N)Work (J)Time (s)Power (W)Trial 1Trial 2Trial 3Average Analysis: 1. What is the relationship between the mass of a student and the amount of work he or she does? 2. What is the relationship between the speed at which a student climbs the stairs and the amount of work he or she does? 3. What is the relationship between the mass of a student and his/her power output? 4. What is the relationship between the speed at which a student climbs the stairs and his/her power output? 5. Which student did the most work? Why did he/she do more work than the others? 6. Which student generated the most power? Why was he/she able to generate more power than the others? 7. One horsepower is equal to 760 Watts. Convert the power output of each student from W to hp. Show your work. Student 1: Student 2: Student 3: Which student has the greatest horsepower? Why? Explain the difference between work and power. Part 2 Background Information: One calorie is the amount of energy required to raise the temperature of 1 milliliter of water 1 degree Celsius. When you eat, you are actually eating chemical potential energy. In your body, the potential energy in the food you consume is converted into the kinetic energy of your moving muscles. Food products list the calories in one serving, but these are actually Calories rather than calories. Whats the difference? A Calorie is equal to 1000 calories (1 kilocalorie). Materials: Snack foods Procedure: Choose a drink and a snack from the list that follows. Determine the number of Calories in each and find total Calories consumed. Convert Calories to calories. Convert calories to Joules. Determine your weight in Newtons. Determine how high you would need to climb (in meters) to use up the energy you consumed. Data and calculations: Snack CaloriesDrink CaloriesTotal CaloriescaloriesJoules WeightMeters you need to climb Analysis: 1. How high can you climb using these calories? (Show your work.) 2. The energy in the food your body absorbs is eventually converted to heat. 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