This is the question:
A bucket is being raised by a single pulley by a height of 4m
B F B=bucket, F=force
The weight of the bucket is 200N. The force exerted by the worker is 210N
How much work is done by the worker?
To calculate work all i know is force * distance travelled = 210 * 4m = 840J which is the answer in the book
Why is F bigger than the weight of the bucket or why is work done on bucket < work done by worker?
No answer in book for this (it only gives numerical answers)
I presume some of the energy is lost as friction. However the worker isn't pulling straight down to raise the bucket. Does this have anything to do with it? The book hasn't covered anything like this yet but i know from experience you can change the force needed by the angle you pull at.