An object suspended by 2 strings

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SUMMARY

In the discussion regarding the suspension of an object by two strings, it is established that neither string can be horizontal while supporting a mass. If both angles are zero, the strings cannot exert an upward force, leading to the conclusion that horizontal strings cannot hold the mass. The analysis of free-body diagrams confirms that at least one string must form an angle with the horizontal to provide the necessary vertical force to balance the weight of the object. This reinforces the understanding of tension in strings and the mechanics of equilibrium.

PREREQUISITES
  • Understanding of basic physics concepts such as tension and equilibrium
  • Familiarity with free-body diagrams and their applications
  • Knowledge of vector components in physics
  • Basic trigonometry, particularly relating to angles and forces
NEXT STEPS
  • Study the principles of static equilibrium in physics
  • Learn how to construct and analyze free-body diagrams
  • Explore the concept of vector resolution in force analysis
  • Investigate real-world applications of tension in cables and strings
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This discussion is beneficial for physics students, educators, and anyone interested in understanding the mechanics of forces and tension in systems involving multiple supports.

crysland
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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.
 
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What happens if both the angles are zero?
 
the string is horizontal?
 
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.
 
When theta is 0, it means there's no force in the y direction.
 
crysland said:
When theta is 0, it means there's no force in the y direction.
So... can the horizontal strings hold the mass up?
 
No, it can't
 
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.
 

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