What force does the dynamometer display?

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SUMMARY

The dynamometer displays a force of 25N when two individuals pull on its ends with equal force. This is a direct application of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. If only one person were pulling, the dynamometer would read zero, as there would be no opposing force. Understanding this principle clarifies why the reading remains at 25N when both individuals exert equal force.

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Kamataat
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Hi! Really simple question:

Two people are pulling on the ends of a dynamometer, each with a force of 25N. What force does the dynamometer display?

Textbook answer: 25N

I'm having a difficult time understanding this conceptually. Could anybody explain why the answer is 25N?

Thanks,
Kamataat
 
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If the other person wasn't pulling back, the dynomometer, would simply move towards the one person pulling it. It would therefore record zero.
Having another person pulling back, is exactly the same as having one end secured to a wall/floor. Perhaps you can understand that idea better.

This is a question about understanding Newton's third Law of Motion. Do you know that?
 
Yes, it's clear now. Thanks!
 

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