Newton's first Law

  • Thread starter brad sue
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  • #1
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Please ,
Explain me this situation
A spider is attached to two threads of equal length that make a 120o angle with each other. The spider is motionless and its mass is m=30mg.
What is the tension in each thread?

According to the Newton first Law, the sum of the force must be 0.

T1+T2+Fspider=0
since the threads are the same length and symetrical, T1=T2.

Fspider=-3.0 *10-4N

so I found T1=1.5 *10-4N

I am surprised to see that the answer is 3.0 *10-4N on each thread

please now I am confused! help
 

Answers and Replies

  • #2
Hurkyl
Staff Emeritus
Science Advisor
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Forces are vectors...
 
  • #3
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Hurkyl said:
Forces are vectors...
ok but how it is help me please?
 

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