Question

In scenario 1, a person pulls with a force $F$ on a string of length $2d$ that is connected to a spring scale. The other end of the spring scale is connected to a post by a string of length $d$. In scenario 2, the post is replaced by a second person and he also pulls with a force of $F$ . If the spring scale reads $50N$ in scenario 1, what does the spring scale read in scenario 2?

• A. $50N$
• B. $67N$
• C. $100N$
• D. $133N$
• E. $150N$

Answer 1

The correct option is A $50N$

The spring scale reads the tension in the string attached to it.

In both the scenarios, the tension in the string is same $F=50N$.

In the scenario 1, the tension in the left hand side of the spring is also F. The cases are similar.