Power

We discussed the relationships between force, work, and power today in an activity that involved finding the power of people running up the stairs. In order to find the power of a person, you need to know the work done and time. To calculate the work done, you need the force and the distance. To find the force, you need mass and gravity. It's a long, annoying chain of work that gets simpler with repetition, thankfully. So Power = work / time interval, work = force x distance, and force = mass x gravity.

So let's say my sister is 55 kg, walking up stairs on planet earth, with a distance of 3 meters in 10 seconds. That would make her force 539 N, and her work done 1,617 J, and her power  161.7 W.