Cable friction and tension problem

In summary, the conversation discusses the equal tensions labeled by T in picture 2 and why they are equal. The participants also question whether the tensions should only exert torque and if they are applied at the center of mass of the pulley. The response clarifies that the nature of strings and cable requires the tensions to be equal and that the torque on the pulley cancels out. Additionally, it is mentioned that the equal tensions are a result of the same cable and no friction in the system.
  • #1
Zeno's Paradox
17
0
Read please example 2 of http://cnx.org/content/m14060/latest/ .

P1
fap6.gif


P2
fap7.gif


On picture 2 there are those two tension labeled by T which are equal. Why equal?

And shouldn't they exert just torque? I know we are considering the pulley to be massless, so no torques. So is it correct to consider those two tensions applied at the center of mass of the pulley?

Thanks in advance for your clarification. :smile:
 
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  • #2
The cable has to have the same T, because that is the nature of strings and cable. It is irrelevant where you applie them. The magnitude and direction matter. There is torque on the pulley, but they cancel out.
 
  • #3
That is because thay are the same cable and there is supposedly nor friction in the system. You might, for an instant initially get tension which is different from the other but you can imagine that the tension is 'transferred' along the cable until they are equal.
 

Related to Cable friction and tension problem

1. What is cable friction?

Cable friction is the resistance that occurs when a cable or rope is pulled through a surface, such as a pulley or a support structure.

2. How does cable friction affect tension?

Cable friction can decrease the tension in a cable by absorbing some of the force being applied to it. This can lead to a decrease in the overall strength and stability of the cable system.

3. What factors can contribute to cable friction?

Several factors can contribute to cable friction, including the material and surface of the cable and the surface it is being pulled through, the angle at which the cable is pulled, and the weight and speed of the load being supported by the cable.

4. How can cable friction be minimized?

Cable friction can be minimized by using lubrication on the surfaces where the cable is pulled through, reducing the angle at which the cable is pulled, and using materials with low coefficients of friction for the cable and the surfaces it interacts with.

5. What are some common solutions to cable friction and tension problems?

Some common solutions to cable friction and tension problems include using multiple cables or pulley systems to distribute the load, using counterweights to reduce tension, and using specialized materials or designs to reduce friction and increase the strength of the cable system.

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