### Power Lab

In the power lab, are group thought that Eric would do the most work because he has the most mass and thought that Ashley would do the least work because she had the lowest mass. We guessed that Ashley would generate the most power because she had to work harder than Eric who we thought would produce the least amount of energy. As we added the books to the current mass of our bodies, it required more work.

Machines would be more efficient than humans when it comes to using energy. We guessed that we would have to eat a little amount of food to be able to climb the stairs with books, we guessed that Ashley would need one piece of cereal, I would need a piece of bread and Eric would need a granola bar. These estimations were guess to how well we would do in the power lab exercise.Procedure: 1. Obtain four books from Mr. Thorndike 2. Go to the staircase under Mr. Thorndike’s room between the 2nd floor and the 1st floor mezzanine 3.

Have Ashley run up the stairs without books from the very bottom to the very top 4. Record the time of Ashley going up the stairs without books with a stopwatch 5. Give Ashley the four books 6. Have Ashley run up the stairs with the four books from the very bottom to the very top 7.

Record the time of Ashley going up the stairs with books with a stopwatch.8. Repeat steps 3-7 with Ben 9. Repeat steps 3-7 with Eric 10. Measure the stairs in meters from the 1st step to the top of the last 11. Calculate the power used by each person using the equation Power= Work/Time where Work=Mass x 9.81 (Acceleration of free fall) x Height 1.

Work without pack = 63.6 kg x 3.34 sec. = 212.424 Newton’s x 3.

75 meters = 796.59 joules 2. Work with pack = 74.5 kg x 3.44 sec. = 256.28 Newton’s x 3.

75 meters = 961.05 joules 3. Power generated without pack = 63.

6 kg x 9.81 m/g x 3.75 m = 2339.7 joules / 3.34 seconds = 651.7 watts 4. Power generated with pack = 74.

5 kg x 9.81 m/g x 3.75 m = 2740.

66875 joules / 3.44 seconds = 796.7 wattsGroup Results: Ashley’s Data: 5. Work without pack = 49 kg x 4.

04 sec. = 197.96 Newton’s x 3.75 meters = 742.35 joules 6. Work with pack = 63.6 x 3.

34 sec. = 212.424 Newton’s x 3.75 meters = 796.59 joules 7.

Power generated without pack = 49 kg x 9.81 m/g x 3.75 m = 1802.6 joules / 4.

04 seconds = 446.2 8. Power generated with pack = 63.6 x 9.81 m/g x 3.75 m = 2203.6 joules / 3.34 seconds = 508.

9 watts Eric’s Data: 9. Work without pack = 89.9 kg x 2.

34 sec. = 210.366 Newton’s x 3.75 meters = 788.8725 joules 10.

Work with pack = 100.8 kg x 2.33 sec. = 234.864 Newton’s x 3.75 meters = 880.

74 joules 11. Power generated without pack = 89.9 kg x 9.81 m/g x 3.

75 m = 3307.2 joules / 2.34 seconds = 1413.3 watts 12. Power generated with pack = 100.8 kg x 9.81 m/g x 3.75 m = 3708.

2 joules / 2.33 seconds = 1591.9 wattsConclusion:When our group did the lab activity after answering the 5 questions after the beginning, we were surprised that we were pretty much on target. We said that Eric would do the most work and Ashley would do the least, and in reality without the pack, Eric did the most and Ashley did the least, but surprisingly with the pack, I did the most work and Ashley did the least.

We said that Ashley would generate the most power and that Eric would generate the least power. And the actual was that Eric generated the most power and Ashley generated the least, which is opposite to what we said.This makes me think that if you do more work, then you also produce more power. We thought that as we added more books, that it would require us to work harder and use more energy, this is true to the actual because our work and our energy increased when we had books compared to when we did not have books.

We said that machines are more efficient at using energy than humans, and that is completely true because our body’s can only convert so much food or power into energy, compared to machines.We said that for us to walk up the stairs, I would have to eat a piece of bread, Eric would have to eat a granola bar and Ashley would have to eat a piece of cereal, we were way off, all three of us would need a piece of cereal because me and Ashley used less than a calorie on each trial and Eric used less than 1.5 calories with his trials. Some possible errors with this lab were things like were we all going at the same pace, did we skip steps, or touch every one, these things could in the end effect how much energy and power we produced.