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Tension In a String

  • Thread starter Lori
  • Start date

Lori

1. Homework Statement
upload_2017-11-4_22-13-46.png


2. Homework Equations

Ook, so i'm really bad at physics, and i need someone to help explain why the answer is P=T+25 N
I thought it is P+T = 125
3. The Attempt at a Solution

Since the system is in constant velocity, then Fnet = 0 so that P + T + W = 0 Why isn't it P + T + 125 =0?
 

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jbriggs444

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Which direction does T pull on the 100 N weight?
Which direction does T pull on the 25 N weight?
 

Lori

Which direction does T pull on the 100 N weight?
Which direction does T pull on the 25 N weight?
T always pull away from the object. So, for the 100 N weight, Tension pulls downward and for 25N, the tension pulls upward
 

CWatters

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Perhaps draw a two free body diagrams, one for each mass.
 

Lori

I have a question to add!
If i know that W = T for the second diagram , then I know that T = 100N right?

I can actually find P since P = 25+T , so that P=125
 

jbriggs444

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Homework Helper
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2,663
If i know that W = T for the second diagram , then I know that T = 100N right?

I can actually find P since P = 25+T , so that P=125
Right!
 

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