Lab 11: Power Lab

The purpose of the lab was to find the power needed to go up the stairs and pull a backpack up with a rope.

We had three bags to choose from. On the left was the heaviest, the middle and the second lightest or heaviest depending on how you want to look at it, and on the right was the lightest backpack.

This is the stair case which we had to walk up and then run up.

========================================================================There are 24 steps to the stairs and each step has a height of .156 m. 

By multiplying 24 to the height, we get the height of the stair case which is 3.24 m.

I walked up there in 13 seconds and I ran up the stairs in 8 seconds. 

Work is equal to force multiplied by the distance. The force is mass times acceleration and the distance was 3.24 m. 

90kg*3.24m*9.8 m/s^2 = 2857.68 Joules

Work divided by time gives power

2857.68 J/13 seconds = 219.82 watts (walk)

2857.68 Joules / 8 seconds = 357.21 watts (run)

I pulled the 6 kg backpack. 

The work for the backpack is 

6kg * 9.8m/s^2 * 3.24m = 190.5 Joules 

The power is 190.5 Joules / 9.65 seconds = 19.74 watts

In the experiment we would just find the work first. After finding the work, we would divide it by the time to get the power it takes to perform the action. I'm not sure if this is entirely accurate as I took two steps at a time when possible to make myself a bit faster.