Lowering an object without breaking the the rope

  • Thread starter Kingyou123
  • Start date
  • #1
98
0

Homework Statement


How could a 1000 N object be lowered from a roof using a cord whose breaking strength is only 800 N?

Homework Equations


∑F=ma

The Attempt at a Solution


By slowing down the acceleration to a point where the force down would be less than 800.
weight=m(g)
1000N=m(9.8)
102.04kg=m
∑F=ma
799.99=102.04kg(a)
7.84m/s^2=a
Would this be the right answer?
 
Last edited:

Answers and Replies

  • #2
TSny
Homework Helper
Gold Member
13,159
3,458
This is not the correct answer. Be sure to draw a free body diagram of the object. How many forces act on the object as it is being lowered?
 
  • #3
98
0
This is not the correct answer. Be sure to draw a free body diagram of the object. How many forces act on the object as it is being lowered?
The two forces are weight and force tension. Where did I go wrong exactly?
 

Attachments

  • Snapshot.jpg
    Snapshot.jpg
    5.4 KB · Views: 278
  • #4
TSny
Homework Helper
Gold Member
13,159
3,458
Diagram looks good. When you set up ∑F = ma, the left side represents the vector sum of the two forces.
 
Last edited:

Related Threads on Lowering an object without breaking the the rope

Replies
6
Views
1K
  • Last Post
Replies
4
Views
5K
  • Last Post
Replies
3
Views
7K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
13
Views
2K
  • Last Post
Replies
3
Views
2K
Top