- #1
2013
- 92
- 0
Homework Statement
Hanging rolls of toilet paper
The one they depend on so that the loose end hanging down the front, but many of the other way around. It raises the question, in which the orders are less force must be applied to roll.
For this purpose, a simplified model are considered, in which the clones
mass m paper roll regarded as a full cylinder with a radius R, which is attached to a rod of length L on the wall. The roller is free to rotate on its axis cylinder. The maximum coefficient of static friction between the paper and the wall is denoted by μ.
Determine the force with which you have to pull the two Aufhängearten at least on paper straight down, so that the paper unrolls. Allows you to choose which suspension is therefore better.
2. The attempt at a solution
- better is that the loose end hang down the front
I need:
- Weight force
- Friction force
- Normal force (pressure force)
How can I calculate the traction power? Which formula is it?
thanks in advance