Direction of Tension: FBD Down vs Up

In summary, the direction of the force diagram in figure b is downward because it represents the opposite end of the wire being pulled in the opposite direction from the force represented in figure a. This can be better understood by imagining two people pulling on opposite ends of a wire, resulting in opposite forces being exerted on each end.
  • #1
werson tan
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Homework Statement


why i figure b , the direction of FBD is in downward direction , whereas in a , its in upward directon

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The Attempt at a Solution

 

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  • #2
Because in the two figures, you are looking at the opposite ends of the wire.
 
  • #3
DEvens said:
Because in the two figures, you are looking at the opposite ends of the wire.
can you expalin further ?
 
  • #4
werson tan said:
can you expalin further ?

Sure. Suppose we are each holding one end of a wire, and pulling as hard as we can. I am pulling to the left, say, and you to the right. So the wire is pulling me one way at my end. And the other end of the same wire is pulling you the exact opposite way at the other end.
 
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1. What is the direction of tension in a free body diagram (FBD)?

The direction of tension in a FBD can vary depending on the specific situation. However, in most cases, it is represented by an arrow pointing away from the object that is experiencing tension.

2. How does the direction of tension differ between FBDs that are facing down vs. facing up?

In a FBD that is facing down, the direction of tension will be represented by an arrow pointing downwards, while in a FBD that is facing up, the direction of tension will be represented by an arrow pointing upwards.

3. Is the direction of tension always opposite to the direction of gravity?

No, the direction of tension and gravity are not always opposite. In some cases, such as when an object is being pulled upwards, the direction of tension may be in the same direction as gravity.

4. How does the direction of tension affect the equilibrium of an object?

The direction of tension plays a crucial role in determining the equilibrium of an object. If the direction of tension is opposite to the direction of a force acting on the object, it can help maintain its equilibrium. However, if the direction of tension is in the same direction as the force, it can disrupt the equilibrium and cause the object to move.

5. Can the direction of tension change in a FBD?

Yes, the direction of tension can change depending on the external forces acting on the object. For example, if the direction of the force changes, the direction of tension may also change to maintain the equilibrium of the object.

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