Understanding the Forces at Play to 3D Modeling Fnety Force

[nmegabyte]

http://www.freeimagehosting.net/uploads/fc212c688b.jpg

please any ideas for 3

 

[PhanthomJay]

If you have been drawing free body diagrams, you should note that the reading on the scale is the tension in the cord.

 

[nmegabyte]

hmmm i am trying it should be equal to zero the other force so they cancel each other isn't right?

 

[PhanthomJay]

In part a, the tension in the cord 'cancels out' the weight of the salami, and therfore, the salami doesn't move (F_net = 0 per Newton 1 for bodies at rest). But that does not imply the spring scale reads 0 for that case, does it? Is the scale reading in part c different from the scale reading in part b? Why or why not?

 

[nmegabyte]

its is the same but i guess they cancel each other because of the same force is this correct?

 

[PhanthomJay]

The tension on each side of the spring scale is the same. But what does the spring scale read in part c?

 

[nmegabyte]

142.1

 

[PhanthomJay]

Yes. In Newtons.

 

[nmegabyte]

there is another problem here is the link if u could help me with that i don't even know how to start https://www.physicsforums.com/showthread.php?p=2677818#post2677818