An object suspended by 2 strings

  • Thread starter crysland
  • Start date
  • #1
crysland
12
0
When two strings are used to suspend an object, is it possible for one or both of the angles to be zero (that is, one or both strings are horizontal to the ground) ? Why or why not? Deduce whether either of these scenarios is possible.

I say no, it's impossible but i really don't know how to explain this.
 

Answers and Replies

  • #2
Simon Bridge
Science Advisor
Homework Helper
17,874
1,657
What happens if both the angles are zero?
 
  • #3
crysland
12
0
the string is horizontal?
 
  • #4
Simon Bridge
Science Advisor
Homework Helper
17,874
1,657
So draw a free-body diagram for the situation and work out the tensions in the strings.

Repeat for a string the makes an angle ##\theta## to the horizontal and another string horizontal.
 
  • #5
crysland
12
0
When theta is 0, it means there's no force in the y direction.
 
  • #6
Simon Bridge
Science Advisor
Homework Helper
17,874
1,657
When theta is 0, it means there's no force in the y direction.
So... can the horizontal strings hold the mass up?
 
  • #7
crysland
12
0
No, it can't
 
  • #8
Simon Bridge
Science Advisor
Homework Helper
17,874
1,657
Which makes sense - two horizontal strings are basically just the one string stretched between two walls. IRL if you hang a mass off the middle, the string will no longer be horizontal - it gets a v shape.

Now do the free-body diagram thing again, but, this time, one string is horizontal and the other forms an arbitrary angle to the horizontal.
 

Suggested for: An object suspended by 2 strings

Replies
16
Views
406
Replies
14
Views
687
  • Last Post
Replies
18
Views
717
Replies
6
Views
612
  • Last Post
Replies
25
Views
2K
Replies
9
Views
351
Replies
7
Views
268
Replies
12
Views
259
Top