Forces on a Pulley

  • Thread starter joemok
  • Start date
  • #1
10
0
i am confused about where forces act on a pulley.
IF the pulling forces act on the edge or bottom?
Also, I don't know why when we pull one end of the rope, we apply an upward force on the pulley and on the other hand the force, tention, act on another end also. Is the Force routed like a "parallel circuit?

You may refer to this image:
http://en.wikipedia.org/wiki/Image:Pulley0.png
 
Last edited:

Answers and Replies

  • #2
2,009
5
Like a centripetal acceleration.. I hearby assert without proof that the force on any portion of the pulley is simply proportional in magnitude to the curvature of the rope and the tension in the rope (and directed normal to the pulley surface). In your diagram, that means little arows evenly distributed round half the pulley circumference, all pointing towards the center (with equal length), in addition to the force F acting on the center of the pulley.
 
  • #3
10
0
cesiumfrog said:
Like a centripetal acceleration.. I hearby assert without proof that the force on any portion of the pulley is simply proportional in magnitude to the curvature of the rope and the tension in the rope (and directed normal to the pulley surface). In your diagram, that means little arows evenly distributed round half the pulley circumference, all pointing towards the center (with equal length), in addition to the force F acting on the center of the pulley.


So u mean the force is acting on the surface of contact. But, how can a force separately act on two object with magnitude the same as the apply one?
 
  • #4
radou
Homework Helper
3,120
6
The contact force is an internal force, and it is irrelevant in pulley problems.
 

Related Threads on Forces on a Pulley

  • Last Post
Replies
15
Views
1K
  • Last Post
Replies
7
Views
4K
  • Last Post
Replies
1
Views
1K
Replies
1
Views
2K
  • Last Post
Replies
2
Views
2K
Replies
1
Views
1K
Replies
6
Views
2K
  • Last Post
Replies
9
Views
2K
  • Last Post
Replies
3
Views
15K
Replies
2
Views
3K
Top