- #1
brycenrg
- 95
- 2
Homework Statement
A window washer pulls herself up using a bucket that she stands in and a pully system that she pulls down on a cord to go up.
How hard must she pull in order to go up slowly at a constant speed?
assuming pulley frictionless and massless
Homework Equations
f=ma
The Attempt at a Solution
I set up a FBD but apparently it was wrong and i don't fully understand why.
I set it up as the bucket+human = T - mg = ma
and the other side of the pull the cord which is Fh - T = ma
Fh = Force by hand
In the book they just say its 2T - mg = ma which I get my Fh is = to T but I don't see how the pulley makes it 2T. It does make some sense as it is easier to pull down then pull up but.. i can't wrap my head around it lol any help?