Tension question

  • Thread starter tristan_fc
  • Start date
  • #1
tristan_fc
12
0
I believe that I was late the day my instructor explained this type of problem in class, and my textbook is worthless, so I thought I would give this a shot. It's just a tension problem, but I don't know for sure how to do it.

A 9.00 kg handing weight is connected by a string over a pulley to a 5.00 kg block that is sliding on a flat table. If the coefficient of kinetic friction is 0.187, find the tension in the string.

I believe that tension is the sum of all forces on the rope correct? I recall my teacher saying that we could turn a similar problem into a problem on the X-axis by making gravity a force pulling on the block in the x-direction. Anyway, I thought that I would just do 9*9.8+-(5*0.187), but that didn't seem right to me because it would seem that a frictional force would increase the tension and not decrease it? I appreciate any help.

-Tristan
 

Answers and Replies

  • #2
tristan_fc
12
0
eh... I posted my question in the wrong section and they moved it here. I'm actually in Engineering Physics I in college, but I guess it doesn't matter where the question is if I get help.
 
  • #3
HallsofIvy
Science Advisor
Homework Helper
43,021
970
Yes, frictional force would increase tension, not decrease it.
However, if there were NO friction force, there would be NO tension on the rope, not the "9*9.9" you have. If there were no friction force the block would move freely. The tension on the rope IS the friction force.
 

Suggested for: Tension question

Replies
13
Views
331
Replies
6
Views
869
  • Last Post
Replies
3
Views
246
  • Last Post
Replies
14
Views
583
  • Last Post
Replies
21
Views
1K
Replies
6
Views
467
  • Last Post
Replies
27
Views
513
Replies
2
Views
85
  • Last Post
Replies
13
Views
674
  • Last Post
Replies
7
Views
950
Top