Find the Tension in the rope ( really simple )

  • Thread starter Thread starter rulzwrld
  • Start date Start date
  • Tags Tags
    Rope Tension
Click For Summary

Homework Help Overview

The discussion revolves around a physics problem concerning the tension in a rope connected to a block moving on a horizontal plane. The block has a weight of 25.0 N and a coefficient of kinetic friction of 0.35. Participants are exploring the relationship between tension, friction, and weight in this context.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to calculate the tension in the rope but finds their result significantly different from the expected textbook answer. They question the elimination of 'g' from their calculations.

Discussion Status

Some participants have provided feedback regarding the importance of checking units in calculations. The original poster has indicated they found the answer themselves, suggesting a resolution to their confusion.

Contextual Notes

There is mention of common pitfalls in physics problems related to units and calculation errors, which may have influenced the original poster's misunderstanding.

rulzwrld
Messages
5
Reaction score
0
Find the Tension in the rope ...( really simple :D)

Homework Statement


A block pulled by a string is moving on a horizontal plane with a constant speed, it weighs 25.0 N and its coefficient of kinetic friction is 0.35 . Find the tension in the rope ?


Homework Equations


Fx = t - Fk
T = Fk = μk * N = μk *mg


The Attempt at a Solution


My answer results 85.84 N ... which is completely off the textbook answer 8.75 which can be yield by μk * m ... I don't understand why does it eliminate the 'g' out of the equation?
 
Physics news on Phys.org


Look at the units mentioned in the question.
 


Lol , thanks, i actually came back coz i found the answer and I knew it was something really stupid ...
 


No problem! Every year, the AP examiners' report mentions that many many points are lost because of units or calculation errors, so always check the units!
 

Similar threads

Find tension of a rope and kinetic force
  • · Replies 13 ·
Replies
13
Views
3K
What is the relationship between tension and mass in a system with friction?
  • · Replies 6 ·
Replies
6
Views
2K
Tension of Rope in Middle is 17N
  • · Replies 24 ·
Replies
24
Views
3K
Why Does Tension Vary Along the Rope in a Hanging Superhero Scenario?
  • · Replies 5 ·
Replies
5
Views
8K
Tension on a Massive Rope: How to Calculate Tension at Different Points
  • · Replies 11 ·
Replies
11
Views
3K
Why is the tension force equal to friction force
  • · Replies 9 ·
Replies
9
Views
7K
Tension in Ropes: Solving Forces on Trunk
  • · Replies 7 ·
Replies
7
Views
5K
Solve for the tension in a rope pulling a box
  • · Replies 3 ·
Replies
3
Views
2K
How Do You Calculate Rope Tension with Friction and Constant Velocity?
  • · Replies 1 ·
Replies
1
Views
3K
Tension in a rope at the midpoint
  • · Replies 8 ·
Replies
8
Views
9K