So it's work over time, or joules per second. The unit of power is a watt. In class today we were looking at how much power we use to run up stairs and we found out all the variables such as our mass (in kilograms), gravity, force in newtons, height of the stairs and each one, time it takes to run up the stairs, and then found our power by using our equations. So i recreated this at home
If my mass is about 56 kg, and the height of the total stairs is .762m and gravity is 10m/s i could find my work by multiplying force (mass x gravity=56x10) so i get 560 N then multiply it by the height i get 426.72 Joules. Then to find my power I divide work by time and if my time is about .2 seconds and end up with 2133.6 Watts
We also went over some older equations with work such as...
Work=Force x distance
PEg=Mass x Gravity x Height
KE=1/2mv^2
PEs (spring)=1/2kd^2
We would plug and chug numbers in to find the speed if we didn't know them, total energy and distance a spring would be compressed.
Yay! :]
Nice picture!! Lol.
ReplyDeleteNice example, and explanation. And thank you for adding those other equations with work. I almost forgot about those.